Personally I now render each CH scene into a H.264 (MP4) file then load that MP4 file into Premier Pro. It requires me to do everything in CH (camera pans, backgrounds, etc). But I find it much faster overall. I then add title dubs, background music etc in Premier Pro. I also do any AE scenes (for special magic) the same way - I use dynamic linking to get the puppets into AE and in sync, then export a MP4 file to load into Premier Pro.
You can export PNG sequences - the only way other than dynamic linking if you want transparencies to work (that I know of!). For my laptop, PNG is faster than dynamic linking. But exporting a MP4 file plays full speed in Premier Pro, so while I have to manually re-export the MP4 files, overall it gave me the best experience.
But this is what I do personally - I know a lot of people use dynamic linking instead. I just found it too slow on my hardware.
Thanks again for responding. I was hoping dynamic linking would speed things up, but I think you're right about speed. I did find (partially through other kind members of this forum) that I could send the puppet to Media Encoder and then export with a codec that offered an alpha channel. So far I've just tried cineform. This gave me a relatively quick encode that looks good and has a complete alpha.
Cool! I had not discovered that encoder before! "QuickTime" / "GoPro CineForm RGB 12-bit with alpha" is what I tried (and it worked). 220MB .MOV file instead of 27MB .mp4 file, but it was a movie file with transparency intact!