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From what I've seen, which isn't as extensive as a professional rigger, there are two kinds of halyard organizer plates, those that sit under the step, which only makes sense on a deck stepped rig, and those that go around the mast at deck level, used for keel stepped rigs. In either case, you need to unstep the mast to install them. I don't want to hijack this thread into a religious discussion, but ome believe that our masts should be unstepped annually others not so much. If you fall into the latter category, it might make sense to do other things that require the mast to be unstepped while it is in that position. That's the reason for suggesting the mast plate.
Note to entrepreneurs: There might be a market for a halyard organizer deck plate that comes in two parts, designed to bolt together around a stepped mast.
Regarding the riser vs aluminum step decision, I think there are multiple "good" approaches here. Pearson used a steel step, bolted to the top of the keel in the bilge to hold an aluminum mast. This put unlike metals in a likely electrolyte solution, which is a formula for corrosion. That was definitely the case with my step. It only lasted 29 years. While at that point the walls of the mast were getting rather thin at the bottom couple of inches, the step itself was fine. By making a fiberglass riser that I then glassed in and using the original, cleaned up step, I minimized cost without compromising strength and reduced the likelihood of the unlike metals sitting in an electrolyte. But even if I only get another 29 years out of it, I think it a pretty good solution. (I'll be 86, the boat 59. We'll both likely be out of service by then.) Total cost: < $100. Clearly, having a step fabricated will work, too. And it will reduce the unlike metal situation. (I say reduce, not remove, because I assume you won't be using aluminum screws to hold the step down.)
Anyway, IRMV. Think it through. That's what these forums are good for. You get lots of opinions, and you know what they are worth - what you pay for them! Good luck.