Nuke TV Dinner and then renuke it 3 hours later?
I would try pre thawing them all so they don't take so long to nuke when the time comes. So maybe defrost them in the fridge a few hours before so you aren't microwaving from frozen. And just stack them in the oven to stay warm while you nuke the rest.

The crazy part of me would disassemble the meals. 
1: all veg in a pot. 
2: all mash potato in a pot.
3: all meats on an oven tray
4: heat it all up on the stove and oven
5: re assemble all meals onto clean trays or clean plates.

But I'm kinda crazy. And it might not be easy if there is gravy involved.

Also if you haven't already purchased said meals why not just get a bag of frozen veg, a box of instant mash potato and a frugally priced meat option of your choice to just make dinner for all at once. (But maybe not an option for you)

That's all my ideas :) good luck!