The shortest path may not be the best path; the Taiwanese would probably have men standing at the coast armed with MANPAD's to ruin a helicopter's day.
Also, the Mi-17 is not ship-capable; you either have to plunk it down on a large, stable flight deck, or you will have to fit something like a haul down device to land it on a small deck. When I mean a large, stable flight deck, I am talking about something akin to a aircraft carrier.
200km radius is not enough for an invasion scenario. You need more, for reserves, emergency fuel, etc.
I would rather use the PLA's transport aircraft and have paratroopers jump out of them, while using the large transport aircraft to drop armoured vehicles in via LAPES into secured landing zones. Transport aircraft can carry more, have good range and are a lot faster in this case, which adds to the element of surprise.