I have cut a lot more Corian than I care to know, with my TS55. It has never been an issue with the saw. The dust extraction is very good, so it doesn't have that buildup problem.
If you remember the bullet-resistant desks I built last year, they were lined with a fiberglass/Kevlar sheet material.
I used one of the Festool fiber cement blades. That stuff was hard to cut, even with that and I wouldn't even try to route it. Diamond bits are available, but I don't know that they are intended for that? It's mostly about wear from the abrasive glue in sheet goods.
I have seen Corian dust do quite a bit of damage to routers though. Binding the columns of plunge routers, clogging and wearing the threads of fixed base routers, etc. We spent 1/2 an hour, one time, trying to unscrew that crazy aluminum square-threaded base, from a Porter-Cable router. I'll admit that none of them were mine, so I can't attest to the care they were given.
I don't mind using my tools, but there is a point, where things cross a line.
Ever one of them goes back into the Systainer, blown off, and ready for the next time.
Tom, that looks to be the perfect situation for the KP rails.
I never came across a case where I "had to" have one, but my OCD tendencies wanted one anyway.