That's how the F18HT's do it, 2 forestays to the hulls and one skinny piece of spectra or dyneeema for the pole tied at mid pole behind the snuffer hoop of course.
The I17R originally had a similar arrangement. There was a single forestay, but it was only a couple of feet long. The bridle wires were long - practically forestays. There was a thin wire to support the spin pole.
Then they switched to a conventional long single forestay and short bridle wire arrangement. This made spinnaker handling easier, since there was less wire out front for the spinnaker to catch on.
