I know of three F type three wheelers within 70 miles from me. And ther is a Gent some 140 miles north of me that has three all definit years. Mostly not driven I suspect only looked at in the garages and at shows.
I have seven old Moto Guzzi singles 1937 and up that I treat the same way. Just to hard to find spares. So I ride them very sparingly.
I am glad to hear so many made it to the USA and your area. Are you in the vicinity of Washington State?