I was looking for a way to override this policy in an easy way, but it seems the Policy extender does not allow replacement of core Policies (yet). A more advanced solution would be to (temporarily) replace the core class using a composer hack, fof/nightmode does something similar here:
Assets.php re-uses core namespace declaration, see:
Anything in this file will then be used. Understand that multiple extensions doing this will cause unclear results and getting a better solution into core would be far more beneficial.
Hope this helps.