I decided to try a Kailh Pro U4; a little more tactility than a Purple, but still pretty mild. @HungerMechanic described the Pro Purple well, and it feels pretty similar with the U4 stem - just a little stronger and with the dampeners.
I’m also preparing an experiment for later today; lubing Silent Box Browns. I agree that they might be worth a look for you. I’ve also heard of (and experienced) inconsistency with these; some make light clicking sounds and others don’t, and I’m pretty sure it’s the leaf and plastic pusher hitting each other. So - my plan is to put a little bit of lube on these surfaces:
I’m going to try it with just inside the box, and another with both sides of the pusher lubed - I’ll let you know how that goes.