Your home sounds like mine, the daycare room is my living room though and the dining room next to it both convert into the sleeping areas for naptime from 12:30-3ish. I close all the curtains and it is like night time in here so they sleep really well.

I have 2 one year old children who have already given up their morning naps but sometimes they have a little nap in the stroller when we are out and about in the morning. Can you get your little ones to stroller nap for a short time like that in the morning?

I used to have all older children ages 3-4 and naptime was just 1-2:30 because not all of them slept that long. When the two new babies started as the two oldest graduated I nudged naptime up to 12:30 because the babies arrive at 8am and can't stay awake much past noon. I did what you did and moved lunch up to 11am so I could get them all into beds (babies first) by 12:30.

Afternoon naptime/quiet time are not a negotiating in my daycare because I need a little quiet break in the middle of the day to make it through my very long days since there is so much to do in the evenings as well. I wish I had a dishwasher! There are always 2 sinks full of dishes at the end of the day, sweeping, vacuuming, then on to preparing for tomorrow, whew! I know it's the same for all of us.