I think this has been addressed elsewhere on APUG; sensitization of Liquid Light to IR if memory serves me.

A few things to bear in mind: dye molecules need to be absorbed onto the silver for effective sensitization. Anti-foggants, stabilizers etc., already in the emulsion may prevent, or hinder this process. The same additives as well as anti-halation dye, acutance dyes may wash out during the swell-and-soak process. You might want to try the swell and soak without dye first, to determine if the emulsion survives the process.

It might work. Worth a try anyway.

Looking forward to hearing about your results.