I have a massive hinged support that I was given when it all happened and I've been wearing that when I've had no choice but to get in a pen of sheep or load them on the trailer. Just a bit of insurance against getting hit again really. I'm looking at it more as a protective thing than trying to support my knee because as you said, I need it to strengthen up by itself.
If it's the hinged type i had i wouldnt want to wear it working. Have a look at the elastic type ones. Much better for everyday type stuff.