It doesn't matter how you view him, his value in a trade will be as a starter. Any team that trades for this guy is gonna view him as a starter. He won't be traded for less than a 2nd rounder, maybe a third cuz it is the redskins.
The OP suggested Thad Lewis and a 6th or Dennis Dixon (practice squad) and a 5th. You'd be lucky to acquire Gibran Hamdan for that price.
Even Tim Tebow fetched a 4 and a 6