Ken wrote:
Any suggestions for overcoming misted sealed units, is it possible to drill
hole and allow it to dry out?

Drill two holes on the outside. (~5mm)
Diamond grit bit in a dremel or something.

At this point you may blow through with some fan, taped to the window.
it'll take a few hours to clear.

Now, make 2cm*2cm squares of glass, and silicone round the top three edges,
leaving a gap of some 1mm and covering the hole.

This should stay clear almost all the time.