If this is a classic/std then you have an accessory light connector in the harness already, fed by Fuse #1 (dedicated for that purpose).
The Purple Wire is constant power while the Red/Blue is from the lighting circuit, only hot with ignition on (would be used to trigger a relay, not to supply high current)
Actually on the Roadster, the same connection is available, also from Fuse #1
This is intended constructively - it would be more helpful if you listed your R3 year/model in your 'ride' than your admittedly interesting list of cars - this immediately identifies your bike to address specific model questions you may have, whether for this question or others in future.