Not yet. Got hit with a major vet bill a few months back and now property taxes coming up. My plan is to go with the yamaha even though it's heavier (harder to disapper). If the Honda already came with the LP carb, then I'd for sure have put the Honda in my sights as it is lighter (though it has a smaller engine).
I don't think (but don't quote me) that a generic monitor board would replace the factory one. My thoughts were simply to put a voltmeter on the power lines to verify that there was power to it and if there was power, but no action, see if Airstream sold a replacement part. If they don't, you'd be surprised what you can find on the web. My DSL router died, so I cracked it open. I traced the problem back to the power supply. Did a Yahoo and Google search with the part number and found several places that could get me one and the issue was not where to get it, but who had the lowest price on it.
Maybe you'd have the same luck if Airstream didn't have the part.
On the new probless system Airstream uses, I worked with Airstream and the actual company that built the monitor system when mine went south. Our unit was replaced 2x, once by me (manufac of the unit sent me one) and once by the factory (Airstream). I've found the factory folks to be a real great bunch of folks. Most of them have Airstreams too.