Agree with the level of get-there-itis involved raised by Adsie however the amount of engines is not the issue. Its the flight rules.
Heres an idea, just so nobody can have a teary. Make them sign a waiver like limited category adventure flights. Should read something like this: "Your pilot has been deemed safe by us(CAsA) to operate an aircraft and carry passengers(We issued him with a license), however, there is a chance we stuffed up. Your pilot may actually be a complete dufus, moron and imbecile. He may kill you. If this occurs we take no responsibility for issuing them with a license. YOU FLY WITH THIS PERSON AT YOUR OWN RISK.