As I understand it, the last version of Premiere that supported "Cineform m2t" and export to tape was 1.5.1.

While I presently dont have any particular need to export back to tape, I'd still be interested to know if there is presently ANY other encoding option (Adobe CS3 Media Encoder, Procoder, TMPGEnc, Sorenson, Streamcoder, or whatever) that can convert a CFHD avi back to a tape-exportable 1080i transport steam?

Excellent question Graham.
Seems like if you could transcode the CFHD.avi to an m2t file, you could open a new Premiere CS3 HDV project, import the m2t and then actually export it to tape.
So, is there software that will do the transcode???

About a year ago there was a guy who I believe figured out a way to write back to tape transport streams that he created using Linux, ffmpeg and freeware. It was beyond my geek-ability to attempt his method, but it does seem to be possible...

Hmmm... I was hoping for something kinda no brainer- like Procoder 3

This thread provides some solutions: http://www.dvinfo.net/conf/showthread.php?p=756443&posted=1#post756443