CaptForce is right that many spinnaker poles simply clip onto a track-mounted ring on the
mast. We use this setup on our J/36, and it's worked for us using the spinnaker in breezes up to about 25 or so knots. If you go that
route, you'll need a hefty track-mounted ring, and the bell can be dismounted. Your
boat is a bit bigger than ours, however, with a masthead spinnaker to boot. The forces involved may be substantially more than we deal with, and a more positive attachment than a track-mounted ring might be called for. (That may be in fact why a bell fitting was used originally.) It might be best to talk to a rigger, who will be able to calculate the loads and determine what will be the safest and best long-term solution. You don't want the ring to fail and have the pole come zipping back into the
cockpit like a missle if you can help it. I've been on boats where the reaching strut wasn't securely lashed, and been glad I wasn't on the foredeck when it shot across with a "twang!" at
head height.