I have no clue if ZPE can be extracted or even exists, but I can admit that all energy has not been identified and accounted.
Therefore this energy could be extracted (not created) without violating conservation of energy and/or thermodynamic laws.
Oh... one more point
Some centuries ago, a person trying to work on, say... electricity, would have been considered as a witch and sentenced to be burnt at the stake
If you are looking for "intellectual shocks" , read some quantum theory articles
We all now that deviating from mainstream ideas can't turn out to be difficult at best, and sometime to be dangerous...