I have wondered, and certainly not exclusively to Solus, if there’s any reason why some “package capture” couldn’t be built in to people compiling from source for distros where a package isn’t available.
Certainly there would have to be a bunch of checks and balances, not blind acceptance, capturing source code URLs, checksums and the like, potentially reproducible builds, but could be a way to ‘crowd source’ packages. Or is this a solution in search of a problem?