Thanks for the feedback! I was not aware there is a (minimal) UCI integration done for Jool - it was not there before.

There's still issue with running Jool in the main network namespace as it is not controllable by firewall rules, does not translate locally-generated traffic, fights over dynamic port numbers and needs to be reconfigured every time the public IPv4 changes. This is all resolved by running in a namespace.

I may look into improving the integration to support namespaces.