I’m running Ventura 13.6.5 and in DEVONthink and in the macOS Print dialog I can convert PS to PDF, and Save to Postscript. Perhaps it’s because I installed and use Ghostscript which provides the pstopdf program. Installed years ago so I don’t remember much more than it exists on my machines.
I guess when and if I move to Sonoma (I’m still waiting), I’ll ensure Ghostscript is installed.
This might be of use to the OP @nanitous before upgrading to Sonoma.