This might seem strange/esoteric, but I think proof this is possible is a good thing and can only drive further adoption of signify(1)
I’ve been using minisign1 lately too, which has some2 signify support too. I found it a bit easier to find packages, and/or build on various platforms.
I packaged minisign for FreeBSD hoping people would start using it :)
I have been! Your plan worked! <3