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I did it for release one of etap. Once I’d got the correct connector size to plug into the shifter it was a piece of cake. I tried little button switches and membrane switches with ribbon cable. Both worked great but were a little dodgy on one ride when the rain was torrential. I did put photos up on this thread. No idea how to find them now but I’ll have a go and link if I find them.
Edit - here is the item, it’s actually related to my di2 but it is the same as my etap hack
https://www.lfgss.com/comments/14182893/
Anyone done a DIY sprint shifter for AXS? I found someone selling them on eBay but can't find them since. Am up for soldering if I can work out what connector the shifters use.