https://waytools.com/products/textblade/2/numbers-symbols It has Cmd (which I presume doubles as Ctrl for non-Apple?). It has physical Tab and ⌂ in the CapsLock position; the latter suspiciously is marked only in green, and I wouldn't be surprised if it also does Escape. And surely you can map Esc somewhere with https://waytools.com/store/showroom/info/multimap/tablet

Select and Edit combos (on home row!) let you access arrows, dedicated prev/next word, home/end and replaces Ctrl+ZXCV. So you're using Cmd(/Ctrl) and Shift less in favor of home row chords. To further deprecate Shift (leaving only letters and ?"), most punctiuation moved to the Fn layer (the green modifier though they don't call it that).

That makes a lot of sense, as thumb-activated Cmd and Fn ought to be more comfortable than Shift.

The only loss in modifier convenience is numbers requiring Fn but that's cheap price for a row off.

=> Seems it has almost everything. The big missing modifiers are Alt and Win/Super. OTOH there is a "Media" modifier they don't elaborate on. I hope the remapping software is flexible enough to map at least Alt.

There will be a big learning curve for shortcut users, though modifier usage _ought_ to be actually more convenient than standard keyboards. (all theoretic)

Hmm, I'm off to try https://superuser.com/questions/96299/mapping-superhjkl-to-a...