Yeah a combo of stick/dowel and sugru is probably what I'll try if I get sick of stabbing it with a pen. Since I use the 1030 now this unit is basically retired for turbo use so waterproofing isn't a big deal. Just bloody annoyed Garmin don't do spares for common failure modes like this.
36EUR for a plastic button?
https://www.lacasadelgps.com/tienda2.0/boton-para-garmin-garmin-edge-1000-p-4316.html
Fuck that. The £1 pen I'm currently using to turn it on is working fine.