Well, it is possible to put the Gsxr cartridges in the 250 fork. Zoran from Twin Works Factory does it for $500.00 if you send him that cartridges and your forks. I have no doubt that his setup would be spot-on from the start as he has an excellent reputation for tuning racebikes.
The challenge will be for us to figure things out without screwing it all up while only spending a couple of Benjamins.
I've already turned down one of the CBR caps and interestingly the GSXR adjuster rod threads right into it. Could be that it'll be a sort of fork mashup that gets us where we want to be.