No worries my friend, always nice to try something new
I've since spoken to a Ham friend who reckons these Airline headsets are the Dog's B's without having to fork out the ridiculous prices places charge for "professional" headsets. After looking at some prices I agree!
Sure, you could work out an 'hourly rate' for your time in converting them but we usually do these things for the love of it. After all, we don't charge our loved ones an hourly rate for the things we do for them
Take it as a challenge for yourself, it's just a few more wires than rewiring a three pin mains plug. You could even make an adapter 'box' and that way you could use these great headsets on any radio you have or will ever have.
I know from recent DX QSO's with our European counterparts that they relish this sort of stuff, often telling me about their homemade mic solutions with great pride. I'm sure they all had massive smiles giving me this info, especially when I tell them "well done, your TX audio is fantastic!"
Anyway, best of luck with it.