There are about three issues you will run into. The first is changing the mount to a 3 pth system. The second is that your 8 inch hose between the vacuum and the mower deck is now going to be too short. The third is the head that attaches to your deck needs to be modified.
To cure problem number two. I sectioned the deck attaching head. It had to be both taller, and longer. I did this on a Kabota B series tractor. It took two days, and about 5 hours of cutting a welding. Have some CAD Drawings of the parts changed. Still a doable project.