Mass remove unavailable entities?

[Plawasan]

I've set up Remote assistant between my Prod instance and my test instance (remote) to be able to use multiple instances of an integration that can only support a single device per HA instance (OCPP for my EV chargers). While this works, somewhere during the installation process I've managed to pull ALL entities from my remote instance into the main one. Now that I've created the hopefully correct filters, I'm stuck with ~370 unavailable entities that I can only remove one by one.

I've tried reloading and then even removing the integration, uninstalling it from HACS but the zombie entities are still there.

Is there a smarter way to get rid of them than dedicating an afternoon to clicking? (And no, leaving them is not an option, they make my eye twitch).

Thanks!

For reference here's my config, my goal was to only bring over the entities that I explicitly list in step 2 (nothing is defined in step 3/4)

(here I know I should remove the light domain)

[Plawasan]

I've realized I can do this via the new filters/checklists in HA however it would make sense to include the filter setup in the initial setup flow for the integration, same as it was suggested in #305