So, an update:
Limera1n was released earlier, and then taken down, then comex allowed geohot to use the userland exploit to allow it to be un-tethered. I'm guessing that it will be officially re-released soonish.
Also, the SHAtter exploit is now being put on hold and greenpois0n is apparently going to use geohot's exploit so as to not waste two boot level exploits in one go.
Seems this thing is starting to work out better than I thought after all, and the best for this project, or so it seems. although i believe that even geohot's exploit is still tethered at boot level, which would mean that openiboot would be tethered if I'm not mistaken... still, its a start!