There are many work-arounds for Umlauts, so that is not a problem for me
That's one thing I'm eager to see in real life. Not to sure about it works out with the Umlauts with an ANSI keyboard. But good to know that you're experienced with it.
The only problem you might run into is that you actually forget how to type on the German layout. This can be problematic if you are often forced to change keyboards in your work environment or similar.
That's not a real issue. Usually there's no need to switch layouts. It's my machine and I don't have to switch machines. Only from work (Windows) to home (MacOS). Maybe I'm going to use an ISO keyboard from time to time to keep a bit used to it.
What is the programmer Dvorak layout?
I'm sure you found it already. In case if not take a look here [1]. Basically it's a Dvorak layout with the same positions for the letters but the "sepcial" signs and symbols are moved to a better reachable position.
But nice to see that the switch from ISO to ANSI is not really uncommon. My co-workers are calling me crazy as I've talked to some of them. They don't see the point in buying a pricy mechanical keyboard and switching to an unknown layout. Maybe I'm a freak (geek). But hey. That's why we're here, right?
Thanks for your input so far. Will report later about the sitching progress. Hopefully there will be some progress...
[1]
http://www.kaufmann.no/roland/dvorak/