When you say nonstandard, does that mean the keys will not properly map out to an English OS, like pressing a 'D' and getting an 'L' or something of the sort?
Germany uses QWERTZ layout.
The rest of the universe uses QWERTY layout.
You can set your keymap to UK layout to fix the Y-Z issue but some punctuation symbols might get switched around too, donno. UK has punctuation in different places than USA.
In any case, if you set your keymap to have the Y key in the normal place, the writing on your Y-key will stay say "Z". At a minimimum its confusing. If it was me it would be fantastically annoying.
Germany just decided to make up their own incompatible format incompatible with the whole entire rest of the planet.
I am looking possible issues in both keyboard and power supply.
I can't remember if the A1200 powersupply has a 110v / 220V switch on it or not.
Is there anything else that might not be compatible for use in the USA? Will the OS be in German, menus and such?
You set the language of the OS on any Amiga. That is not a problem at all.
If you were going to buy Petro's super custom A1200 and put it into a Tower Case and use a
real keyboard then all your keyboard problems disappear. This is what I do. I am using a brand new 2012 springloaded PS/2 keyboard.
You could buy a $3.00 set of stickers and cover up the Z key and the other key with the proper symbols. If they swapped around any other symbols, punctuation, etc. maybe u could fix those with stickers also. Dunno. Depending on what they did it could get really complicated.
I only learned of German QWERTZ layout a couple of months ago. Until then I just assumed everyone used the same layout. HA!