This is the feature I would use this for. I've written custom solutions to do this in the past, and while I'm confident in them, it induces a large cognitive load to make sure they are secure. I would much rather trust another, well-vetted solution (meaning, of course, this has to reach well-vetted stage, but if I were in need, I'd spend time vetting).

GPG is well-vetted. The encryption here is GPG.

My pleasure! Glad you dig.