Something like this perhaps: Trail Gear Interlocking Tube Clamps
This should work and keep most of the structural integrity.
Problem is you have to unbolt, remove AND store your roll cage somewhere.
And then you are going to have to have a helper to put it back on.
If you live somewhere that you can't leave trailer outside due to HOA restrictions or high theft area, then it's easier to understand why you want to do this.
I did section a roll cage on a Mule for a customer a few years back for same reason.
We basically lowered the cage 5.5" and he still had 2-3" of head room.
I have pics on my computer somewhere and will try to post pic.