Back in the early days of the spinnaker development I did have the pole stayed from the bridle chainplates initially. This works ok but the angle from the chainplates to the end of the pole is too sharp and you will probably damage the chainplates (tearing them forwards) by doing it that way (they are only built to handle upwards and inwards forces).
Better to take the stays from the bridle chainplates to some point on the pole between the chute mouth and the end of the pole and accept that the pole will bend some when it is under load. If you are using a windsurfer mast (as most of us do) use the bottom end rather than the top and it should be strong enough.
When you rig the pole this way you may find you need to add some "dummy" stays from the end of the pole to the tips of the bows - you can use bungee to avoid loading the bows. This stops the spinnaker sheet dropping over the bow and under the boat when you are taking it down. Try it first though. If your sheets are the right length you may not have this problem.
Having said all this, "Red Alert" was a light plywood boat with twin forestays, but the spinnaker pole stays on the bow tips didn't cause a problem for that one.
Twin forestays don't work with a spinnaker though - it had to be changed to a bridle setup. To avoid loading up the hulls a fairly high bridle was set up, with a fake bridle below it to support the chute and the pole.
Like this ...........