Hey there,
It's pretty much down to what FastSpring supports, and I don't think they are likely to take bank transfers. Accepting payments directly isn't something we really want to do for a variety of reasons, so it's pretty much down to what either FastSpring or other distributors can do. If GamersGate, Impulse, Steam, etc, are able to take your kind of payment, then when the games hit there you could get it that way.
Hope that helps!