I'm almost positive a friend of mine in the US can do it without a problem. His name is Perry Ercolino and he lives outside of Philadelphia. He does hand welting and hand sewn soles as well as machine stitched.
I've seen people send their JL shoes to him and prefer his work over the actual factory.
Give him an email or call and I'm sure he'd love to talk with you about options. If you want to talk to him, I'll even let him know ahead of time to introduce you guys!
According to his website his prices start at $225 plus shipping for benchmade footwear.