Thank you for the kind words!
This is the specific LED strip purchased (for a different project) and wound up using here. It utilizes SK6812 led, with a density of 60/meter
If I were to do it again, I’d probably go with something like this strip from digikey, or this strip (if you prefer a bezos link). If you wind up searching for your own, searching for a “5050 led strip” and “30 led per meter” will generally get you pretty close. Just be aware that many / most of the strips available appear to come with a waterproof coating, which really isn’t needed (and may even be a negative, if you have clearance issues).
And I would definitely stick to qmk compatible.
I, too, am hoping for my heavy-6 by year’s end, and am contemplating some des sliders once they roll out the 2u sliders. 