My guess is it might offer some help, but perhaps not much. I doubt focus shift would be much of a problem, as the Rollei material doesn't extend very far into the IR range. That same limited IR range could mean you won't get much fill, as in daylight the film requires about six stops additional exposure with a 720 nm IR filter which passes the near IR range barely outside the visible wavelength (but I guess there's one way to find out. )

Could be fun to try. What will you use for an IR flash?