Dude, you live in Edmonds WA!!! I know I have my sunroof open for maybe 3 days out of the year (damn rain
)
The thing is, if your going to be installing the transistor and relay anyways, you might as well install the motor too. That will give you manual controls. The sensors are simple to install after all that too.
So, to put it simply, there is a way but it is just a small step further to get it fully functional.
All that said you will never catch me pulling my dash apart to install one of those things
Good luck man.