Fella's. Remember, that head set is certified in the same manner as any other aircraft part.
Rewireing will lead to the loss of the headsets certification and WILL result in action taken against the Aircraft's commander if a communications failure is found to be the result of that modified headset.
You're safer to purchase the adaptor, which is available at many locations worldwide.
FYI...I do not, and will not, allow modified equipment to be used on my ship.
"What could possibly go wrong?"