I like to call it "bigot chicken", but yours is more alliterative.
talentedkiwi
Can't speak to how difficult it would be to do after the fact. My guess is just adding in the lines in the docker compose. As for CrowdSec, it seems to run in the background and I haven't looked at it much. I've triggered it a few times and locked myself out. So I've added my home IP to the whitelist (it's running on a VPS). It also locked out my uptime Kuma so I whitelisted that too.
I've never really played with it, but was hoping it might help. If I have some time this afternoon I can play some more (honestly I'm intrigued as well).
In the mean time, you might try the command below and see if it will work instead. It should just return messages already sent, it I'm not sure how many.
ntfy.sh/mytopic/json?poll=1
You might be able to start with the built-in json stream
https://docs.ntfy.sh/subscribe/api/#subscribe-as-json-stream
See if you have a microcenter near you. Not sure about delivery though, but I love that place.