If I understand your method correctly you may be asking for trouble. I would move the stays up a hole or two (or one side up to the first hole) and attach the forestay to the bridle, not tie it off. You would then tension the shrouds with either the trap wires and a harness or the main sheet pulled over to one side. IMO if you just tie off the forestay to attach it later after putting the jib on would not be too safe.

Clayton