Or you're looking far enough afield.or you've been putting too much faith in internet myths
There is nothing special about fork seals. They're a regular non descript 2 lip, lowspeed seal... available at any hydraulic house... even in Mexico.
... but you have to know that
... and you can ride a bike without fork seals. It'll be bouncy, but it beats sitting in Plata del NOWHERE.
You want parts availability?
You can buy any and every part for a '68 Camaro, except for the VIN plate, in the aftermarket... and Mustangs, and G bodies....
If there is enough of a market, someone will make and sell it.
Me? I have never heard the myth that the Japanese part stream was infallible and I wouldn't believe you if you tried to tell me it was.