Miller is working on this, check it out

"To Pd announce:

A very preliminary version (0.1) of a VST3 plugin named PureVST is
available on msp.ucsd.edu/tools/purevst . As the name suggests, it runs
Pd within a VST host such as your favorite DAW.

I'm releasing it, so far, as source code and as a packaged VST3 plug-in
for MacOS (Apple silicon) . It compiles fine for linux and (I think)
for MacOS/Intel - somebody brave might want to see if it can work on
Microsoft Windows too

I'm sure there will be plenty of problems/questions/comments. Perhaps
for now it's appropriate to write these to the Pd mailing list, although
it might someday be worth setting up a different forum for that.

cheers
Miller"