Dick, have you thought of, or considered, alternative repairers for your RK instrument?
Surely another company such as the one below can do the repair work and find a work-around to RK's "captive customer" design?
I have often carried our repairs in other fields of endeavour, that involves removing components that are made of unobtainium, and installing more-readily available, and less costly components of a different brand.
Of course, I understand with aviation, certification and CASA approval are over-arching parameters - but with a company that specialises in aviation instrument overhauls and repairs, they will surely know the work-arounds to avoid the total rorts such as RK indulge in.
This company does speak the soothing language all owners like to hear .. "Our team of highly experienced technicians perform quality repairs and overhauls, quickly and at a
reasonable price" ..
They advertise FAA repair approval for both RK and Agusta.
Ahlers Aerospace - Repair Station