If tightly wrapped (double foil) and the cooler air space filled with towels to eliminate the air space you will be fine. FYI-there are a few tips to extend the FTC window-preheat the cooler with hot water, run the towels thru the dryer but you should be fine. And when you are ready to serve let it breathe for around 5-10 minutes before slicing and don't slice til ready to eat as the flat can dry out before your eyes! Enjoy the eats.
If you have the SWMBO green-light then go for it. Since you have a large you asked about another LBGE. The benefits of that move are that all your eggcessories are interchangeable. If I had the green-light given the initial scenario you described I would go with a second LBGE. Either way you come out waaay ahead.
I have refrained from comment but @henapple's "This has got legs..." post reminded me of a quote waaaay back in my youth..."Perfect set of legs...foot on one end....on the other". And that's w/o a crossword puzzle around the knees! YMMV-