Nuru
This is what I did.
I got foldable ROPS with my 4300 but they were to tall (I knew that ahead of time) A machine shop blew the welds of so I could reuse the folding brackets. I cut the tube off a few inches and rewelded.
In your case I would take some pic's of a foldable rops. If you don't have the equipment and or skill I would hire it done. remove your roll bar and build a new one the way you want it. make sure it's stronger than the original. If and when you ever sell or trade it will save you buying a new roll bar. I was informed that a modified rops could have ever lasting responsonbilty. You would be liable if the rops failed another owner down the road. atlest that is what I was told. If I had more time I would have done it this way, so it will cost me $600 one day for new rops.
DDT