I have to admit I've been unsure what to do since first reading this thread. Bobby is 5 months old now and I've recently stopped confining him in his crate when left alone so he is left free in the lounge-diner. (He's restricted from the rest of the house as I have 3 cats who have not yet come to terms with the new addiction to our household.)
Anyway, yesterday I took the plunge and bought a 6 ' tree, which is about the biggest will fit in my room and my car, and decorated it with tree lights, hanging balls and a few other things.
As the tree is in the lounge-diner inevitably there are long times when Bobby is alone in the room with the potential for mischief.
He only shows modest interest in the tree, although he was quite excited when I was putting it up and decorating it and, so far, I've had no problems. The worst problem so far is that he likes to drink the water from the tree stand. I guess if that's the worst of it then things are OK