Honestly, that would be a reason for me to go back to a Topre board. I used to have a Novatouch, which was okay, but the upstroke clack was too annoying. Then there was a meetup, where I could try the FC660C and the HHKB 2 (Pro and S), which felt much better. I really dislike the FC660C with the odd design choice for those 2 extra keys on the right side, but the Type S was very pleasant to type on.
Do you already have a rough estimate on how heavy one of these cases are going to be?