I would add instructions on running the app under Rosetta for older externals. I would *not* start providing separate builds.
Forcing Rosetta is also something extensively documented online and on Apple's own website:
I would say we really only need a small note underneath the download link such as:
On M1 systems, you may need to force the app to run with Rosetta for externals which are not yet compiled for arm64:
Right-click on Pd, choose Get Info, check Open using Rosetta.
2) make a better solution for the status quo (either seperate builds or some big warning + instructions on the download page)