As explained in the sales literature, you are most certainly going to have to replace the top link.
None of my Kubota top links were long enough so I had to cut them and weld in 6-inch pipe extensions to them. However, I have not had to replace any power take-off shafts because when I had to shorten some of them for use with my power take-off driven implements, I shortened them as little as possible just in case an issue like this should arise. Therefore, there is sufficient overlap of the two parts of the power take-off shaves, but check your operator's manual for each implement to be certain you will have enough overlap because it does set the tool at least 4 inches further back.
In addition, I had to add more front-end ballast for my sprayer because the front end became too light with a full tank. These also can cause reduced turning radius clearance for implements that are not 3-point hitch mounted. They caused an issue like this with my mower caddy when I turned sharply, so I completely removed the movable hitch devices to which these couplers are connected, and the issue was resolved, but not before I bent one of the unlocking levers on the new coupler.