When my ITBS is/was at its worse, I can rely on the indoor rower for cross training. The rowing helps me with core strengthening, particularly the glutes (glutes/tfl strengthening was needed for my case). I get no ITB pain with rowing.
I've got into the rowing and ended up buying one.
I've used eliptical trainers as part of rehab, and steppers, but for me rowing is my preference.
If you looked at the FIRMAN institutes FIRST running plans, these are based on 3 runs plus 2 cross training sessions. Their recommendations for minimising injury risk is swim, bike or row, They are not keen on weight bearing cross trainers. I don't use their plans but it provides you with some publshed thoughts on cross training. Just a note of caution on FIRST plans - they are quite intense, and if you fear injury, may not be appropriate