Looks like you have a plan. When faced with the same issue, I disliked the design of the standard track and went instead with Harken's small boat track. More expensive, but what can I say, I liked the feel and looks of it. I'm sure, in actual use, what mostly matters is how you configure the cars on it. And from your other post I take it you are intending to go for a similar solution.
One note, the Harken cars can be disassembled so a block can be added without using an additional shackle. I didn't know that when I bought them, because originally, I wanted to use the blocks they came with. But it made upgrading to ratchet blocks super easy.