Here is the gear I bought to replace the stuck stuff

Mainsheet: Harken 7:1 low profile system with Samson Ultralite rope.

Barberhaulers: The N5.2 deck is small enough, I don't feel the need to have them.

Center bar: I have sailed a 1987 without a center bar. I have a 1982 w/centerbar. I think the center bar boat is stiffer, but your crew won't like it.

I know nothing about spin. add-ons. I personally don't think it requires one.

It is no big deal to drop the sail out in the water. Pull the halyard straight down, rotate the mast, easy out the halyard line. The sail should come loose easy.