I really recommend you get quotes from a broker who will trawl the market for you and get it done by a professional operator. IMHO something in the last post sniffs of illegal Commercial Air Transport to me. The pax are clients not employees and it could therefore be assumed that there was a "valuable consideration" involved even if you don't get paid in used fivers.
LHC at Redhill have a B2 for charter. I wish there were more around.