If you want to testify, asking them to subpoena you seems smart. I can't see how a subpoena could make testifying look worse, and yes, it just might alleviate some employers' concerns. But your first step seems to be deciding, for yourself, if testifying is the right thing to do. What if someone asks, "Did you ask to be subpoenaed?" Most people won't go that deep, but wouldn't you still like to feel comfortable answering that? Do you want to let unproven fears about this somewhat crazy but very diverse industry sway your decision? What will you think when you look back on this in 5 years?