I think it might be better to have someone such as Molyneux do the debating, part live on their show and part live on his, though, as he's an experienced debater, and I'm not sure about either of them. I've got a really strong feeling Stef would do it. I'm confident he'd wipe the floor with the guy, too. I've seen him wipe the floor with someone who I agreed with on a particular issue (and, still do, but his debating is far better.) The issue wasn't really a libertarian issue, BTW, at least in my opinion.
Also BTW, this has a sort of "let's you and him fight" appearance to it. Libertarians seem to be good at recommending that other people do things for liberty, and Ian, for one, is fond of saying "You want it done, why not do it yourself." I'm thinking Ian and Mark might be happy to sit back and listen to you debating Seder.