I'm thinking that a hand tied wire leader like those that fly anglers use for pike and muskie flies wouldn't be so bad. They're a lot more limp and less visible than any of the commercially made ones since they're not plastic coated, they use thinner gauge wire, and don't have the crimps, swivel, and snap. I might have to try because I really like using smaller hard swimbaits like the Sebile, but I lose too many.
Something like 30# CXX may do the trick too, and that would be easier than using wire.