As far as the curing process is concerned.....air doesn't effect the roe after it has been cured as no bacteria can grow (if it has been cured properly). So i don't think that storing in a vacuum sealed mason jar would help make it last longer, and i agree i think the heating would weaken the integrity of the roe.
My thoughts, best way would be to vacuum seal the roe with a little borax and then freezer. Also makes it easy to only take out small portions at at time.....unless you used the teeny tiny mason jars.