For Mr 1olbull, sir.

Adapters are now here. But we still have wiring to finish.
 
So after a quick and refreshing dash about on the R3 - I set to roughing up the inside of the lens (and my fingers). The effect is certainly different. Tomorrow I will improve on the wiring a bit, epoxy the lens on and do some waterproofing to the rear of the case. Photos once done.