Hi Scott,
There
should be no problem doing that. I'm considering doing the same thing this fall. Multi-species cover crop mixes are becoming very popular. Some farmers are planting mixes with 10 to 20 species to provide a variety of ecological functions such as
carbon generation, nitrogen fixation, pest suppression, subsoil tillage, erosion control, pollinator interest, and nutrient accumulation, to name a few. Google "Gabe Brown", he is one of the leading multi-cover crop dudes.
Thanks,
Mike