As far as I know, there were R65 bikes with a wire wheel option available in europe, but not north america.
The issue with the LS wheels and rotors is that the hub width on the LS wheels is quite narrow. You will need a different rotor carrier (dish depth is different) when used with another wheel for the front calipers and rotors to stay in alignment. An early R80 monolever (ST) front wheel hub will work (though it is a 19 inch wheel instead of an 18, the hub could be relaced to an 18" hoop or you could just run with the 19 wheel and adjust your front fender bracket/fork brace if needed.
We have a member on the forum from the UK with a very cool looking R65 cafe with wire spoked wheels setup - he can definitely give you more specifics