I backed up some information using clockworkmod in bootstrap. But if there isnt an easy way to do it, then I wont worry about it
If you have the 235 update you can do it. I'm certainly not rehosting it. Just do the INSTALL 235 option and it'll downgrade you. Sounds like a big pain in the arse though. The riskier (and I mean SERIOUSLY) way to do it is to restore your 235 nandroid on top of 246, but, it's not a good idea at all. Or use TiBu to restore what you need from your CWR backup.