Super helpful examples! This definitely narrows-down some categories and materials.
The Gateron Clears: Short answer, yes they are the culprit. It sounds to me like these are polycarb-housing versions, which are nice and rattly from the factory. The “outboard” design of the GMMK isn’t a bad thing on its own, but also does nothing to mask noisy switches. All that said, it’s totally possible to tune-out all that clinky chattery rattle with lube and films on those same switches. I’m not sure if they’ll ever sound like what you’re going for, though - lube will help deepen the sound but only so much.
The Chocs: I’m not sure what exactly gives them the sound they have as I’ve never actually seen or used them, but I get what you mean now, especially in context of the other recordings.
Reference recordings: These really help me narrow it down. For the most part, I think you’ll want to look at dampened / silent switches - and if you don’t mind putting in the effort, I think you’ll want to lube them, and where needed, film them.
O-rings: Maybe? I really didn’t like them myself, but they might be a good option if you do like reduced travel, as they will give more of that softened thud - only on the way down, though. I’d generally put these in the band aid realm.
To see if switches need films, I pop a handful into a hotswap and put some thin caps on them. Especially with silent switches and with switches that have otherwise been lubed, rattle will indicate a loose housing, with which films and gaskets help tremendously.
The recording you liked a lot is of a JWK silent linear, and while that particular edition is hard to find, very similar switches are readily available. I think the general family of switches you’ll want to orbit are MX-compatible silent linears with the possible inclusion of Topre - I think you were using the “classical” definition of “thock” all along.
If you’re open to tactiles (which Topre are by nature), they tend to have a more loud, layered thock compared to linears of the same weight. The Zilents in IO Sam’s video are an example of a silent tactile - expensive but generally loved. Lately it’s been nudged out of the silent tactile spotlight by the Boba U4, which has a stronger, wider bump - it’s really tactile so it may or may not be enjoyable. They are a fairly decent facsimile of Topre, inasmuch as is possible with a completely different mechanism.
I’d also gather from these preferences that long-pole switches probably aren’t the best with some very contextual exceptions involving other parts and specific housings.
So - a few specific recommendations:
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Boba U4s: These might be a good option if you have that kind of sound as a priority, don’t mind a pretty strong tactility, and don’t want to fiddle with tuning your switches - they do have a nice thocky/thud sound from the get-go. That tactility might take some getting used-to, but can be great for fast typing once you do.
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Gateron Silent Blacks: Relatively inexpensive and also having a great, if grainy sound right from the bag. A little tuning with lube will bring the sound a little closer to the Serikos from that recording. I really do love the sound of these; here is a recording of some stock ones mounted in a GMMK fullsize.
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Durock Dolphins & Daybreaks: A relative of the Seriko switches in the recording you liked, these have a different colored housing and stem and use a different spring, but the shaping of the plastic components is the same and they use the same type of dampener for the sound signature. The two names just refer to two different spring weights.
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Gateron Silent Inks & Ink frankens: While I think these feel more smooth than the “vanilla” silent blacks, I also don’t think they sound as great, especially before tuning. – That said, Ink housings are among the few I think you might like with long-pole stems because of the deep sound they make, especially when paired with something like a polycarb plate. It is louder and sharper than the recorded examples but it does have a deep if sharp “thocky” quality.
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Niz Electrocapacitive: These aren’t MX-derived switches at all aside from having the same keycap mount, these have more in common with Topre switches, being electrocapacitive rubber domes. They don’t sound, feel, or work the same, but they do have more in common with each-other than with most other things available. These are tactile and “thocky” - they fit MX keycaps but otherwise don’t share any parts or conventions with the MX-compatible universe. They have their own tuning methods and are pretty much their own thing; you can’t swap them into any old keeb, for example - so these aren’t a recommendation for your GMMK so much as a potential, less expensive consideration down the road alongside Topre.
There are quite a few other switches that might give you the kind of sound and feel you’re looking for, but I think these are great places to start your search. Let me know if you have any questions about these or anything else!
PS; this is a really old post, but you might get something out of the other recordings posted there: Informal Silent Switch Comparison