My previous bike was a RSV4 Factory and it came with a private plate. The one fitted was spaced R5V WP, but I had a legal one fitted, so R5 VWP.
I've own DUC 996R, I've also put a pre 1962 plate on my triumph thruxton R, because it looks the part (black and silver) Private plate on my Jag F type V8 R, H8 FTR.
Same sort of idea just a different budget, my wife gets the plates when we buy new because I’ve got such a poor memory