Currently, when a dimension gets unpowered with you in it, you are simply killed in the usual way.
What would be cool is that instead, a TE or Entity gets spawned, frozen in your previous position, which you can kill / destroy to get back your items. (Edit: or, alternatively, the player will be teleported back to his frozen corpse when re-entering the dimension, although that would require an EEP or WorldSavedData instance and some additional work).

The player himself either gets teleported out on this occasion or, if preferred, will be teleported to -1000 y (to prevent grave spawning), stripped of his items (given to the frozen entity), and then killed.

I'd think this might be a good alternative, although it might be worth adding options in the config for all of this too.