The freezing process is well understood; there are things you can do to prevent your cigars from dehydrating during freezing, thereby preserving the RH of the cigars.
Your cigars would also require some sort of protection to keep from drying out in the oven -- even for an hour and it's not like you can use your five-finger bags or any poly wrap to protect them. Not to mention a whole lot of other potential problems...
If you are worried about beetles I would stick to using the freezer... Just my
(and maybe not even worth that much
)