nuts n' bolts
Here is a couple of ideas.
#1 Now I never tried this, but it might work. Find a piece of solid steel rod the same length as your seatpost, that fits snug inside your seatpost. Figure out the angle you want, and bend your seatpost with the steel rod inside, with a long pipe, like I suggested in my above post.
#2 Find a piece of solid steel rod that fits snug inside your seatpost, cut the rod to your desired length ( allow plenty of length in the frame and desired layback ), and bend it with a long pipe to your desired angle as suggested above. Then cut your seat post for the shims, one shim for the seat clamp and one shim for the the seatpost clamp ( I would make the seatpost shim at least 2-3 inch long in to the frame ), use a cutting wheel (maybe a hacksaw would work) to cut the shims length wise to allow the shims to squeeze on the steel rod when the clamps are tightened.
These are just ideas, they might work, they might not work. Just got to try it. At worst your out a seatpost and piece of rod.
Itried to bend a regular seatpost without a tube bender and it kinked. Good luck.
Dangerous Dan