I'd say just try it first as you have it, but... carefully. On a trainer, you may well find you don't need every gear available, especially the extremely low 1-2 gears which I think might be the only issue.

SCRATCH that.. the problem is using the small front chainring with the smaller rear cogs that need to be avoided (which is a somewhat mid-range gear). And on a trainer those could be found useful but should be avoided.