I talked with Bruce Tharpe a few months ago, and he said to just use the bent wire that came with the kit. It was fine after all of his testing, he said.

I went with a bracket but this was before I spoke with Bruce. If I had known, I would have gone with the wire.

If it makes you happy, use a ply doubler ( I did!) and don't install the tail wheel bracket. If needed in the future, you will have the doubler already installed!