I have thought about this too...at least ubtil i got my bandsaw. :)
It seems to me that a piece of 1" x say 15" (or appropriate length fr
your saws table top) clamped with spring clamps would work and be very
eaasy to adjust. I had alos thought that the blade drift issue could
be overcome by using a larger type spiral blade. Spirals cut in any
direction so there is really no drift. I haven't tried this though.
Please post your findings b/c you my brother are the guinea pig!
Here are some good scroll saw related links too: