Thanks for the answer benpierce. Apologies I've probably phrased this badly.
In Studio One you can transfer Fat channel settings used for recording a track to a Fat channel plugin added as an insert on a mixing channel in Studio one. You can then retain the settings used in tracking with one button click and tweak them later when mixing in S1. Once a Fat channel plugin is inserted in S1 processing then occurs in the insert chain for the channel in Studio One not in the channel of the StudioLive console although I believe they can still be linked and controlled in both directions. The question is have I missed a magic button in S1 to make the processing run on the mixer DSP but still in the S1 insert chain?
32 channels of DSP based EQ and compression could then be leveraged for mixing when tracking is complete (a Presonus version of UAD DSP powered plugins!!) Antelope audio are working on a plugin VST wrapper to allow this with their audio interfaces so it doesn't seem impossible (although probably technically challenging).
That amount of DSP power would take SO much load off my PC that even heavy sessions would become a breeze and the new Fat Channel plug in would be top of my studio wish list!