[Waltthesalt]

Recommend you check with a sailmaker on a storm jib arrangement. There are balance conditions to take in consideration.
There are lever operated devices that can allow you to have an inner stay that is normally kept at the mast. The lever does the tensioning. There is an issue where on the mast the top of the stay is as you'll likely need that to be at a point where there are shrouds.
Many just have a storm trysail for extreme conditions.