I have post-cured my fuselage tub. It wasn't hard to do as I had already built a frame that clips onto my workbench that I can cover with a tarp and heat the inside to accelerate curing, which also enables layups in otherwise off-nominal temperatures.
I post-cured to 70C (158F), but this was just the tub. As Kent mentioned, beware of the temperature limits of blue wing foam.
I am no epoxy expert, but my understanding is this: Post-curing is merely a continuation of the chemical process. As such, it really doesn't matter if there is a period of time between initial cure and post-cure - if there is still a reaction possible at higher temps, the post-cure will accomplish it.
Side-note: When the above is generally true, I am also using a non-standard epoxy, as the commonly-used ones are not available in this country - except West, which has the worst properties of those deemed acceptable. I have better options available here, and they were chosen with much research, discussion with experts, and subsequently with inspection by experienced builders including a former Scaled employee. All were satisfied with what I have.