I don't see why not. Pat's only extends a very short distance past the three point ball joints so it shouldn't interfere. Which telescoping side links do you have? Maybe someone here can give a more definitive answer.
Yes, Pat's Easy Change does work with telescoping arms. We have thousands of customers that use them every day. My brother has a JD 5400 with the telescoping arms (used in most of our photos) and they work great. My L4310 also has them and have never had a problem.