I too don't see why you'd need additional holes/mounts for the pole bridle. On my Stealth (unlike the other Stealths)the wires for the spin pole simply attach to the existing forestay bridle tangs.

The only holes you'd have to drill would be in the front of the mainbeam to take the pole end fitting and, of course, any holes for the spin fittings themselves. These could be kept to a minimum by sheeting the spin either from the trampoline track or base of the shrouds. The mast fitting could be a dyneema line looped over the top of the mast but you'd still have to drill the track near the top to take the rotation loop.