There I was at the drawing board designing a "universal afocal camera adaptor" when I thought to google that phrase. Here's what I found.
http://www.agenaastro.com/Afocal-Pro...ar-ag-afoc.htm
Almost exactly as I envisioned it.
Looks like an ideal and cheap way to enter the world of astrophotography for those that already own some sort of non SLR digital camera.
cheers