Data protection prevents all now for the private indidual hence V5 not displaying previous keeper details but agree to cookies on a web search and every f***** trying to sell you pony knows your entire preferences.
Once (maybe still) you could claim a vehicle hit your car/property etc failed to stop and for a nominal fee DVLA supplied keeper.
Scrotal media appeal is your best bet.
Offer a reward and some nosey parker will crawl out the world of keyboard warriors but once the owner knows you want it the price will be silly I suspect.
Alternatively get that reg' plate made up stick it on another bike commit loads of motoring offences and then I'tll be in every agencies radar
