Dave's enquiry made it to the right team members, for direct integration conversations.
This is a very good and interesting request!
I have also received requests from several institutions (e.g. national A/V archives), asking about FFV1 support in Adobe Premiere.
Looking forward to your answers.
Thanks in advance,
It has now been 8 months since this request got forwarded to the Adobe development team.
I sincerely hope that something good came out of it?
There is a persistent rumor 'on the web' claiming that Adobe has an agreement with Apple about not supporting any standards that Apple doesn't approve of. Hopefully, that is just a rumor.
That rumor is laughable.
Anyone who likes can write importer/exporter plug-ins, to support whatever file format they like, even overriding PPro's own handling of those same files.
Advice: Yes, writing FFMpeg-based plug-ins should work.