Hi, I know the challenge and the problem, its really difficult in some markets to get Propane, and Propylene even more difficult.
H2 would be available, but probably not a great solution for a few reasons including cost.
Using LPG is not really effective as LPG is a commericial mix of gases, and not well regulated usually, and the vapor pressure will vary greatly.
You might investigate some of the following:
http://www.gastechcorp.com/home87
I have not used it, and am interested as well to know the field results from Asia.....