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Typically spinnaker poles are too short to pole out a '150' genoa.. it will 'work' but won't be ideal. An extendable whisker pole is a better idea. Spinn poles tend to be heavier too. I wouldn't expect you need the downhaul/uphaul rigged to use as a whisker pole - unless the pole is simply to heavy to be supported by the sail itself.

 

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You've got about a 12 ft J measurement.. so a pole extending to 15 feet or so should do. the second on on this page looks like a fit, as an example..

FORESPAR Heavy-Duty Telescoping Twist-Lock Poles | West Marine

 

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.....I'm also thinking about getting brave and try the spinnaker when I take along a couple extra able bodies.

Dave

Atta boy.. that's the spirit!