I may have done something wrong but I couldn't get this to do what you expected.
Oh I'm well familiar with Action Objects. When I first started building Pennsylvania Station in 2009 I ended up with a model that had 74 of them. I returned to that model recently and the first few screen renders were frustratingly slow in v19o & p.
On a hunch/whim I decided to rebuild it as a single model importing all the parts that used to be action objects. As of today the model is 18Mb but renders are back to being typical. However finding patches and aligning normals during a save is more than a minute so I'll probably start a new interior detailing model with the double doors and many other additional components and add & constrain it in the chor.
Thanks for your suggestions, Robert.