Sounds like there is no inexpensive way, other than making some sort of bolt on pedal extender attachment like the ones shown. Having seen the results of welding 2 different alum alloys, and the resulting failures I don't think welding is a option unless you are sure of the exact alloy used. Do alloy research on the net, your welder might not know (mine sure didn't)

Is there a lack of chainrings for 130? Maybe we can go low tech, work in the opposite end, how about some sort of raised pedal platform that extends the length of the pedal. It might be easier to weld the pedal mech to a extended spindle. I can picture it, but having a hard time writing it.

That way you can use any crank.