Hi. I have never had this problem, but I'll give you my input anyway, because that's the kind of person I am.
I know a mom with a special needs child. When the girl was younger the mom made a "safe room" where there was nothing that could hurt the child and nothing important she could damage (of course there were toys and books in the room). That way the mom could take a shower or make an important phone call and know that her girl was safe for a few moments.
So, if there is any way you can create an area where there is nothing to break or tear down to use for time outs, perhaps that might be a start.
I'd also like to put in my feelings about time outs. I know everyone has different feelings about TOs, but they really worked for me with my 5 year old. When she was younger she had some gnarly tantrums (my 10 year old has had 2 tantrums her entire life—I swear). I would put her in her room and tell her she could come out when she calmed down. Then I would sit down with a cup of tea and a book or a magazine and I would completely tune out the noises coming from the bedroom.
The escape that I got from reading helped my own anger and frustration diffuse. Sometimes it went on for a LONG time. Sometimes I had 2 cups of tea and read a whole chapter! If things got quiet in there I might go listen at the door and find that she had started playing quietly. But when my daughter came out, we were both over it and, frankly, I felt refreshed! I was calm and could be loving. We might talk things over or we might just sit down together and read. We got a fresh start. It really helped me through a tough time. I came to look at tantrums as an opportunity for a coffee break.
Good luck.