Yes, if this hive comes out of winter strongly, I want to split it into two hives as well. These bees I got are very healthy and gentle, and well acclimatized to this area already.
I have plenty of new boxes ready to add in the Spring. I'll be putting together about 50 new frames this winter so I'll have enough for new deeps and supers for two hives. They are wintering now in their two old deeps in order to minimize disruption for them.
I too worry that they will die over the winter! It's irrational but I can't help it. I'm like a worried mother hen.