Thanks!
I think I miiight have found an exact match: https://www.aliexpress.com/item/1005005073296395.html Not sure what a waterproof USB port is used for but it should do the trick. I'll buy a few other connectors of similar size to hedge my bets and do as you say if this one doesn't quite fit.
Looks like I'll be starting a new plastic compartment container...
That is my previous experience. I guess i missed it somehow.