This is a really useful thread, have installed Crowdsec + bouncer as per instructions (thank you!).
Particularly being able to persist the changes, thanks!
Just to add to anyone else following thread for first time, this location has examples of commands (such as viewing bans, listing installed / available plugins etc):
Seems a shame the way this other thread went, in terms of maintaining the new releases:
I've tried to build new packages for a wifi module using openWRT SDK and failed.
Perhaps will try and look into again in future.