You could use a piece of wood or angle bracket attached so it lines up with the right side of the slot in the throat plate.I don’t, but I want one and I’ve spent quite a bit of time to measure and design one. Trouble is I can’t find the right thickness of stock and have no way to cut it if I did. I could use an old blade for the stock but again, I don’t have anything to cut it. I’ve used a water jet cutter to do similar things for me but it’s not cheap.
You can buy them too:





