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This might present itself as a suitable contender, compatible with Windows, macOS, iOS and Android:

https://www.keychron.com/

Yes, I have a K1 and a K2. I'd prefer a 65% layout, however, and the upcoming K6 sounds more like what I need.

That’s unfortunate! I’m in the market for a new iPad to replace the one from 2013 I’m using now, and it would be nice to have a full-featured keyboard to use with it.

the easy (and free) answer on mac is to use karabiner elements to remap keys.

https://pqrs.org/osx/karabiner/

Between karabiner and hammerspoon you can 'program' almost any keyboard.

edit: misread the 'iOS' but will keep this here for mac users

What does 'decent' mean for you here? Something portable? Or are you more concerned about battery life?

Good mechanical keyswitches and a solid BT implementation that doesn't time out and enter sleep mode too quickly.