I’m in the UK so I would like to have a keyboard that has the at-symbol and inverted-commas in the correct places for my fingers. The Keychron Qn Pros all come with keycaps that have the ats and inverted-commas the “wrong way round” for me so I was wondering if I buy a Q2 Pro and a set of keycaps, will I be able to put on the keycaps that I want and remap the two keys using Via so that they send the correct characters?
Though ISO layout is relatively less adopted, some of the more popular keycap sets and custom PCBs do have ISO variants or add-ons. So you should be good until you look at exotic/tiny/niche offerings.
As an activity, you could take a look at the past group buys and offerings, and note down how many times did a designer not support ISO layout in an offering you liked.