Exchange frames without frame number

Moin, I bought a R6 several years ago without the intention to take it to the road. So I didn’t pay any attention to whether the frame number fits the papers and I didn’t have a purchase contract (no idea if I had one at all). I got a vehicle letter (certificate of approval part 2) for a RJ05. The frame installed however is an exchange frame without a frame number. Visually it could be an RJ05 frame. It looks like I don’t think that the frame is stolen. But now I would like to put the moped on the street. My first idea was simply to buy a different frame and to convert everything. But that’s not very cheap. The next thought was to have the frame number punched out of the papers. Is this possible without the old frame (the one from the papers) at all? your proof that it is not stolen? For this I would have to have the KBA confirm that the frame number is clean in the letter, right? And the third option would be to buy a broken frame and punch its number in. But also there might be the problem to prove that my frame is not stolen. Should it turn out at the police that the frame number in the letter has been stolen what happens then? There is a blank frame and an exchange engine in it that my bi No one can prove the stolen vehicle now, can’t they? If the papers ever belonged to my vehicle. What strategy would you recommend me? I have a lot of time but little money.