Ability to change fabrication duct pressure classes during spooling/validation

Currently, we have to select a service, material and pressure class prior to drawing Fabrication duct. Once the duct is drawn, the user loses the ability to change pressure class within Revit. It seems to be that a duct with at least 1 open connector can still be changed, but once both ends of the duct are connected, you lose the ability to change pressure class. I have tried scripting this with Dynamo without success - It seems to be bound to the same limitation that the user has when manually trying to change pressure classes on a duct that is connected on both sides.

It would be nice to be able to change pressure class on a duct system that is already complete without having to MAJ it into AutoCAD, run a script there, and then MAJ it back into Revit. This is a common procedure in our spooling/validation process.