I would not change the angle of the needle valve. It looks fine the way it is.

If you leave everything as is, and have trouble getting the engine adjusted:
Buy, or build, a cradle that will hold the plane inverted. That will put everything in a more 'natural' position and make the needle easier to reach. Once the engine is running, flip it upright when you pick it up to carry it to the taxiway.

I've seen several people with inverted engines who flip the model to make starting easier.