Not sure if you have seen it, but this might help (once you figure out how to surface the windows metadata): Updating python node in multiple scripts - #15 by jacob.small
Execute this from outside the active dyn file (for the active file you’d want a view extension, which might be good for a new packages offering), as any open dyn will overwrite the parameter values if you save in the session.
Been awhile (Dynamo 2.8?), but it should still work baring a CPython update or two (8?).