Then please tell your Apple buddies to fix it!
Well as a follow up, it looks like it actually IS possible to have a multi-timbral instrument setup with the source tracks set to midi channel ALL. In that case the articulationSet channelizing will pass through, skipping step#2 mentioned in my last post. So that would work. The key for adding those is to create the AU3 instrument track and then create the next track using New Track with Same Instrument, and make sure they are both set to midi channel ALL, but with different port assignments.
Cool, thanks. I'll update Logic and check if it all works
Gitlab may be a little confusing to figure out which button to click to download it the easiest way though. I have just added it as a release in GitLab, which means it should be less confusing to figure out how to actually download it.
Use this link from now on:
https://gitlab.com/dewdman42/Logic-VEP-MultiPort-templates/-/releases
That page looks like this:
(click on the link "Source code (zip)" to download it)