Just operate it on the "N" register and bypass all these problems - just fly it!
Although the Hiller became an archaic relic some decades ago in the UK, they continue to work for a living elsewhere in the world - and still do a pretty good job. The Allison powered Soloy 12E's were the ultimate, plenty of power, very reliable yet still simple.
A few years ago the Hiller suffered very badly from a lack of some major parts - notably Main Rotor Blades (pretty important part). This resulted in some operators cannibalizing their fleets, although once the parts became available again, they seemed to just crank them up and go. Someone contacted me recently about certification on some some British manufactured Hiller blades they had on a ship they purchased (?) - but I really didn't know anything about them.
The assets of the company were sold yet again, and I know that Blades were once again available (not conversant with the current situation though). It depressed the market for a while, but they seemed to bounce back. As you can now purchase a brand new Hiller 12 from the factory, I would imagine the parts situation is back under control.
If you want to see the World, fly Hiller; as it will be passing by pretty slowly!
(And don't forget those hyper-sensitive controls either
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Hiller Aircraft