double bladder wing

The Hollis Katana II is sold in a single bladder and dual bladder variant. I found a single bladder at a good price, but I suspect I will, in the future, want to do some warm, technical diving, not in a redundant lift drysuit. Is there anything to stop me from modifying this single bladder...

I like the scubapro donut/xtek form harness combo. Only problem is they dont make a dual bladder version (for wreck diving, doubles w 3mm wetsuit(bc redundancy) Has anyone ever successfully modified one of these for a dual bladder? Would it be stupid to attempt this? Anyone know a shop that...