Will I be denied entry to Thailand if I leave before my METV expires and re-enter shortly after?

Hello! We are getting the 6 month multi entry visa from mid-March to mid-Nov (we will do last entry/exit in Sept in our last days so we get the last 60 days to extend into Nov). We have some friends who are holidaying in Thailand in Nov/Dec so we would like to stay and all holiday together.

Do you think we would be denied entry if we leave before our METV expires and re-enter 3-7 days later? The plan would be to get the 30-day visa on arrival upon re-entry and then extend for another 30 days. We are a family of five (two adults, three young kids). I'm just not sure if there would be a reason for denial for doing the 6 month visa then re-entering after.

Our reason for travel is holidaying and making life easier for ourselves with young kids - otherwise the kids would all just be sick together at home during the winter and I'd much rather be stuck on the lovely beach/pool than inside in the cold back home. Plus it's a lot more affordable to get help with childcare.