With a mizzen, a
wind vane may have issues hard on the wind because of turbulence off the mizzen
mast and sail. Many boats, especially of that lineage, will self steer in those conditions so may be a mute point.
You have to be careful and prepared when tacking. With a horizontally pivoting
wind vane, you have to turn the vane so the pivot is in line fore & aft with the
boat. As long as you do that, the vane will layover as the boom comes across without any issues. If you forget to align the pivot, the mizzen will probably knock the vane off so you have to sure you bring spare vanes cause I'm sure somewhere along the line you'll forget.
As far as which type of vane, deepends mostly on you and your wallet. Monitors turn up used all the time for less than $2,000. As long as you can get a straight run for the
steering lines connection to the
helm, would almost guarantee one would
work with your boat. Would probably
work even better if you ditched the
wheel and went with a tiller. A
Hydrovane would give you the
safety factor of the auxiliary
rudder though may not be as responsive as a Pendulum Servo Vane. Have done a solo Transpac on my
Pearson 35 with a WindPilot Pacific Plus Auxiliary Vane and it steered fine DDW in force 4 winds. Had an Aires on our Westsail and never touched the
helm if the sails were up.
With a vane, you could probably get by with a relatively
cheap wheel pilot or tiller pilot as you'll only use it powering when there is no wind.