Glad the 24hr thing isn’t staying. A case in point against it has just arisen: UE doesn't like my TOptionals...
I marked my question here as answered when told what I was trying to do couldn’t be done. Because I’m a stubborn sob, I kept trying different things and I now know the answer given may be incorrect and would’ve liked to update the thread (but can’t). Discussion/learning/enthusiasm curbed, and more problematically, anyone searching for an answer to this problem in the future may now erroneously believe the same thing (that TOptionals can’t work with blueprints)…