high aspect is undesirable for stronger winds you will heel more as the pressure is on a longer lever a flatter cut sail will give you much nicer ride and easier to sail upwind without having to dump the main as much in the gusts
Hull and keel rebuilt and faired
adding a lot of roach to a genoa would affect the sail balance and recutting a sail would be more than half the cost of a new sail and in the end you would still have an old sail
i had a 1973 26 mk II and found if the drains from the sinks were not shut off that would cause water ingress when heeled perhaps that or the head backflowing
I would just get a cockpit camp stove for cooking underway there are some nice butane or propane single burners and the propane safety issues are not as major in the cockpit