Hi there, thanks for the advice!
Yes, the opacity method worked great.
I would also add, for anyone else who might try it, that there has to be a blank clip at the end to fade into, as with crossfade - but if you are 'fading IN' to a clip from a blank one, the opacity has to be lowered not on the end of the blank clip, but on the beginning of the one you are fading into.