Well thank you for all the suggestions

Yes I am getting soft, but mostly in the area of prefering a non-misted up flip front to the goggles.
The pipe has a minor issue in that it usually takes me about 12 matches to get the stuff to actually burn and keep going. Some sort of petrol-electric igniter system is tempting but probably rather dangerous!
The hair dryer isn't so daft. From my VW Beetle days I have basically what you describe, aimed at demisting the screen a little sooner than the piped exhaust gas system on the Dub. (I used to carry goggles in the car, when the heater started to make you cough it was time to open the windows regardless of the outside temperature!). Said "hairdryer" and some plastic tube........

?
Andy