Thanks for the suggestions!
I have decided to still attempt a preschool and still keep my baby at home. I will do this my having my assistant take a group, or perhaps just my daughter during this time. I will provide a full day service still, with free yet semi-structured learning environment in the AM and more structured preschool school in the PM. I do have experience with multiple-aged teaching, and believe it has great benefits, so long as I keep to a age 3-5 age range. I will be using a Reggio based teaching philosophy.
Thanks again for all the support and great suggestions, keep me' coming!