Here's your chance to get your very own Batcycle! Correct 250cc displacement like the original but based on a DS7 instead of a YDS3.
1972 YAMAHA 250 BATCYCLE REPLICA
https://www.mecum.com/lots/DA0920-419342/1972-yamaha-250-batcycle-replica/
Wow, that's hideous. But I'm sure there is somebody willing to pay good money for it.
Here's the original when it was on display at the Petersen
(photo credit: OC Register)