I have used my 124G with an 89B (695 nm cutoff) and didn't really worry about it; unlike the earlier IR films, the light spectrum for today's IR films barely extends outside the visible spectrum and as such I don't think compensation is that important. Now I admit that is an opinion, not carefully researched fact.
That said, I think on many lenses the IR adjustment amounts to using approximately the next depth of field mark toward closer focus as the indicator mark.
I'm shooting handheld ir portraits and they are focus critical, I'm getting clearly unsharp results at close distances. I'll try the dof trick. I wish ir film wasn't more expensive.