Even if it does kink somewhere, does it matter for a fill tube? I squeezed my fill tube through a tiny hole between my case and PSU to get into the upper section of my case, cut the inside diameter of the tubing to almost nothing through that small area. But what is the maximum flow rate you need from the top of the fill tube (I think of it as my mini-rez) into the rest of your system? During the process of filling the system you can move the tube around so it's straight, and once the system is full, if you have that much liquid moving from the fill tube into the coolant-loop, you've got bigger problems than a kinked hose to worry about.
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