Hi Lou,
A real bummer!
I don't have any better ideas than the ones already given. I suppose you have tried BCS in Stockton.
Exactly where is it cracked? A good shop can do a lot to weld up worn journals, but cracks are a different matter.
Denis Welch UK has a super expensive forged steel crank for about $4,000, but I doubt if you want to do that.
The stock cranks as original without a front damper, won't stand much operation above 5,000 rpm.
Good luck, let us know what you find,
D