Depending on a load calc for the items that are considered 'required' you may want to re-think this from square one. A 200 amp ATS with load shed technology and a 20 KW natural gas, or propane, genset should solve this.
Many McMansions here use the above 200/20 Load shed & I have not heard any complaints.
As to your layout, I see no issues of NEC compliance; the only possible issue may be Article 400.7/400.8 cord uses, depending on details of the pin/sleeve setup.
