Not sure if this at all practical, but could it be possible to use a desiccant rotor; possibly using your lower power heater for the 'water release'?...
This is news to me, can you provide any links as I've never heard this mentioned before! It sounds very interesting to say the least! (although it is...
Interestingly, the screen for my car has the dimensions given below, but as stated in the email, they say there is a shorter (height) version too......
Those look to be full retail cost from Pilkington, as mentioned before, Autoglass gets them from Pilkingtons but are likely to be more open to giving...