I wll add my opinions to this.

I have raced Portsmouth with a tiller on the old style Wave. I did not find them to be an advantage except during light gusty conditions when I was scrambling around.

Ronstan type connectors work and tillers well on Waves. I would suggest mounting them on the front or the bottom of the tiller cross bar because of how close the sail can be to the bar. I found that a Marstrom A Class extension, collapased is about the right length.

If you are worried about drilling a hole in the crossbar, you can surface mount a Ronstan style connector.

I think this a good proposal overall.