Would probably be fine if you planned on rebagging. As others have shared, there are 3 areas of concern...
1. Oxygen availability
I'm not sure rebagging with O2 is necessary, but is nice if you've got a setup for it. Simply spending a couple minutes to rebag will help increase the O2 concentration back to normal atmospheric levels. Using large bags and keeping the ratio 33%-50% water vs 50%-66% air, I don't think O2 is necessary. Another option would be rebagging using breather bags, but as best I recall they aren't meant to be double-bagged, which I think all cichlids, 1" fry aside, should be.
2. Ammonia build-up
The ammonia pads wouldn't be necessary if people would fast their fish well enough, but also would be cheap insurance against a mistake if you use them in all the bags.
3. Temperature
RegalBlue had a good suggestion. What I've done is use small heatpacks meant as foot/hand warmers. I'll activate them, wrap them in a few sheets of newspaper to help buffer them from touching bags on accident, and tape them to the top of the styro lids.
