There are various options like these:
Wind sensor HRÂ*-Â*nke marine electronics
Standard wind sensorÂ*-Â*nke marine electronics
And fabricating something similar isn't too difficult. We made some stupid long, & tall ones for the America's Cup, in efforts to get the sensors out into clear air.
The catch though (on length & placement), is that you don't want your
instruments in a spot where the upwash from your various
sails, makes the
reliability of your readings go to crap. That, & putting them in some locations creates a bit of a risk of them getting snagged by, say, a
spinnaker sock/snuffer, or even the kite itself.
I'm thinking that it couldn't hurt to talk to a couple of pro's: an
electronics guy or two, & a rigger or two also. Given that both professions deal with this kind of
gear on a daily basis. Well, assuming that is, that there fairly far up the
food chain/learning curve.
Meaning, in
English, pick a couple of the higher end guys (especially those that deal with
racing boats) to discuss this with, as they should have heaps more experience in dealing with such things.
Also, spend some time talking to the manufacturer of your
gear, & stay on the
phone with them until you get a guy who's been there for a while, & knows the in's & out's of their gear. So that he can advise you on various options which likely aren't stock, or in their product catalog.