For a silent and portable keywell you’ve basically only got the Glove80. Their new Cherry Blossom silent switches is where I would go. Voyager is also an option but only slightly less expensive than the glove and you lose the keywell. I’d definitely go for that if you’re willing to drop the cash. There’s usually a few used ones up for sale on the MoErgo discord

I really liked my Keebio FoldKB, which I wrote about here, although for me the main attraction was its similarity to a standard keyboard, which sounds like it isn't a consideration for you. I currently have a Moonlander, and the last time I was going on a trip, I packed it up but said "f*ck it" because it was just too cumbersome, and just relied on my laptop's keyboard. I've taken my FoldKB on trips before, though, and it was much easier to take along. I think I will continue to use it on trips.

I think kinesis nicked the design?

Idk which is older but didn't they both blatantly copy the Ergodox layout?

I have commuted with an Ergodox and I honestly just find it a bit too large. If you are set on that many keys I'd suggest you check out SliceMK since they made a low profile Ergodox. I'm not a fan of ZSA since they are overpriced (cheap plastic) and haven't really ever done anything innovative IMO. Although I don't use it often my SliceMK wireless Ergodox is really solid.

Ergodox EZ is fantastic, I've got zealpc zilents installed in mine for silent tactile. Expensive switches, but I've been transplanting them between new keyboards. I got the EZ from a friend when he wanted to go to a moonlander.

I specifically selected the Moonlander because I travel often and needed the small form factor, while also retaining the split design and large number of keys.