Not used one for BIAB, but I don't see why you couldn't. From memory they don't have a temp controller on the element, so if you run the boiler power plug through an STC-1000 and put the temp probe inside it somehow (dangle it over the side or make a permanent thermowell) you can control your strike and mash out temps with that. The clips around the side that normally hold the lid on should do OK for holding your grain bag too.
Can't comment any further sorry.
Cheers,
RB