In case the TextBlade doesn’t ship, eventually I’d be looking for other solutions too. Though in my case, my main focus wouldn’t be the physical keyboard, though that is important. Rather I’d start with wanting to know what the latest options are for programming one.
Because I’d want to have it work as much like the TB as possible! Certainly this would mean I’d need to have it read multiple key combinations (to get things like “command”, etc). And recognize if the space bar is held so it can do a “green layer” (and shift-green layer).
Essentially I’d want to only be using 3 rows for almost everything, just like the TextBlade. Oh, I’d certainly make use of the other rows, but I sure don’t want to have to reach for number keys any more! I’d use the other row keys for some special stuff. Much like I use the emoji layer now - I set some stuff so, even when the keyboard is set aside, I can reach out and do some basic things with just two fingers without having to set up both hands to do the same thing.
Don’t know what apps can do all that and, of course, which keyboards allow it.