Hi Will,

Well, first, you want eggs not larvae for the queen.  Second, you will
need a healthy supply of royal jelly from a good population of nurse
bees.  From your post it appears that there are very few bees left in
the nuc. So either start one fresh with a queen or unite the survivors
with your other colony.  Since I'm not sure where you are it's hard to
give you an accurate suggestion on whether it's a good idea to start a
nuc now. Best of luck.

Kent