That thread I mentioned pretty much has the code that needs inserting. However, some people find Python a bit daunting... lol

for actor in scene.Actors():
    if not actor.IsProp():
        continue
    try:
        materials=actor.Materials()
    except:
        continue
    if not materials:
        continue
    for mat in materials:
        ....

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks