I have had my whisker pole on the mast for a very long time. I don't know if the application will work for a Spinnaker pole as you have asked, but it works well with my jib going wing and wing. I have used it also with my cruising spinnaker as my whisker pole is line extendable. It is so easy to deploy alone, it makes complete sense when sailing short handed. I've posted the only picture I have where you can see it stowed. Basically, in my case I screwed a length of track to the mast and put a car with a block on both top and bottom of the car. I mounted a cheek block at the bottom of the track and another about four feet above the track on the mast. On each cheek block, also screw a stainless steel strap loop (can't remember what they are called exactly). Take a line and put it through the little strap and tie a knot in it so it can't pull back through. Thread the other end through the bottom block on the car, back through the bottom mast block, up to the top mast block then to the top car block and tie off on the top block strap loop. Leave about a foot of slack. This gives a 2:1 purchase to raise and lower the pole. I put a pad eye on the deck in front of the mast with a shackle to hook the pole to when stowed. Add two clam cleats to the side of the pole at a convienent height that are mounted in opposite directions. The middle of your hoisting line passes through them an can lock the car from moving up and down. We end up with a small loop of line between the two clam cleats. When stowed, just hoist the pole up, lock it in the shackle and tension the hoist line into the clam cleats. It will stay there. Above the top block I mounted another block on a swivel. That is my topping lift that is attached to the outboard end of the pole. I put a cleat on the side of the mast so when the pole is deployed I can level it with the topping lift. When ready to use I release the pole from the shackle on the deck and put the lazy sheet in the pole fitting right on the deck. In my case the topping lift is already cleated at the correct length when I start dropping the car. The pole just starts moving forward and levels out perfectly when the car comes down. I have to push the pole to the correct side of the forestay as I start while sailing on the opposite tack to where I am going to end up, so gravity is working against me. Once deployed and locked into place, we gybe the jib, pulling the sheet through the pole fitting and square it off. Very easy. When time to put it away we just roll up the jib and the sheet slides through the pole as the sail winds up leaving the horizontal pole against the forestay. I've also just gybed the jib and come up to sailing on a reach or even close hauled with the pole still attached to the lazy side. They don't call it the lazy side for nothing. I stay away from the foredeck when above a beam reach. After rolling up the jib, we motor back to the slip and put it away at the dock. Nice.
I hope this helps. See if anyone else has done a similar setup with a mast that is like your's with the integral track. Some of those have an exit block halfway up the mast that you could use to raise the car. Just have some kind of downhaul to tension it in place. You can use a spare jib halyard as a topping lift.
Good luck.
Allan
