converting Juju setup from MAAS to manual?

[Peter Grandi]

Potentially given that we rather rarely add or remove physical
servers from our small (12 nodes) the cluster arguably we don't
really need MAAS, and given the current state of its local
instance perhaps we'd rather get rid of it.

In theory one static node provider is the same to Juju as
another, would it be possible to "transparently" convert our
Juju nodes from MAAS-provided nodes to manually managed nodes?

If so, how to do that?