Good morning Peter
Some, if not most of my wanderings have an element of Heath Robinson about them but I enjoy seeing how the crew at the thinking end of any dinghy has approached a task. The result has to be efficient if not elegant, although the two often go together. Phil Evans at the front of Steve Goacher's very successful Flying 15's, does all their fitting out and has some excellent ideas.
The 49'er diagram is very much overkill. We don't have the length of luff to cope with and is not practicable with deck layouts such as ours: but the object is the same. Get the spinnaker under control and stowed as quickly as possible.
My proposed striker line halves the length of luff and a striker bar in the bow gathers in the material into a manageable size for stowing in say a companionway turtle. Anything over and above that is a case of, "sweeten to taste".
By the way a bone to pick. Given Amy E. has a yellow hull, I would have loved a yellow/white spinnaker. Ah well, I will have to think again.
David