Maybe not even make a civilian version, just allow people to buy the military version. When Arnold Schwarzenegger bought a military Hummer back in the day, they weren't selling civilian versions. I don't know how much he had to do to make his truck road legal, but I wouldn't be surprised if he had to do something.

Schwarzenegger bought his because he wanted a unique vehicle, one that almost nobody else had, and that was a true military vehicle. Ukraine could probably raise money from people who wanted the same thing. Sell them the same bike that is being used on the battlefields of Ukraine at a significant mark-up, and let them show that by their purchase they're also supporting the Ukrainian efforts.