Being an answer of no authority and absolutely opinion only- I say go for it. I THINK that if you were to reseal it in a vacuum pack it would be ok.
Nothing can survive in a vacuum, right?
see if you can make a bunch of pre-measured, single serving sleeves. Open one, squeeze out all contents onto sandwich, and throw empty packaging into the bushes.
Am I behind the curve? Does everyone already make single serve pouches?
Anyway- It'd probably taste funny if it got funky.