I realised that I do actually need a wrist rest for my keyboard, and my old one had one that was screwed in to the bottom of it and as a bonus has two feet under the rests to give some raise. I unscrewed them and have extremely dodgily attached the wrist rests to the new Keychron with several pieces of double-sided sticky tape and it works an absolute treat! 😁
The wrist rests actually have TWO little extended feet on each so you can also get some tenting going if you have the outermost feet retracted and the inner ones extended, so my next project is going to be getting some wood cut to the right length so I can attach it under the new keyboard at the top so it doesn't immediately fall inwards when I have the wrist rest tenting set up.