You don't have to remove the code, you can just pin the version you're using and go for quite some time (sensitive to security context). Most builds are pretty easy to do with 5 minutes of following instructions or whatever build tool. I did this exactly thing with termux (an app I relied on) when they removed sending sms due to a google rule change.

Also, you only have to do it if you're the only one left. Chances are very good that there are others in the community that may step up wholly or in part. Sure the risk is non-zero, but the point of freedom is that you could if it came to that.