you only have a few options to be honest then.
1st, get a reverser, easiest fix as it just slides on, downside is the availability of them and the very high price being asked for them, same old story with them now and thats the dreaded "supply & demand " .
2nd maybe consider a similar mod that i performed which is a heck of a lot cheaper and works better as its not another parts added onto the pto shaft.
3rd, if you dont want to get different implements then you may wish to sell it and get a simliar machine with normal rotation Pto output.
its a problem that many B6000 owner have, there are implements outthere that will work but thats double the kit to own and extra to purchase.
i dont think there are any other options to be honest.
i wouldnt spend silly money on a reverser unless i was going to get a good return against the outlay.
rob