Charles, I had a NACRA5.2 which never had a captive base, and here's how I did it. First, I attached a small padeye low on the mast. Then have a short piece of line tied to the dolphin striker. Position the mast ready to raise, and when you put the mast casting on the mast ball, tie the line to the padeye, tightly. This keeps the mast tip from popping up and killing someone. When raising mast this way, it helps if you keep pressure forward along mast towards the mast base. Also, having boat with stern uphill and upwind, can also help. This small line saved me & friends many times. Untie after mast is raised. I still do this today out of habit, even with the captive system.
Where to position the padeye will depend on rotator, downhaul, etc. You may even be able to use something already in place.