The new PKL[eD] has a modular approach. I've been working hard to make that a fact. The only thing I can't do for you is make help images automatically (you'll need to install Inkscape or Inkscape Portable).

With an ISO keyboard I'll strongly advise you to use at least the Angle mod! It's a near-standard. You don't want to subject your wrists to extensive ulnar deviation while typing, and cheat mods will bite your behind in the long run. Unless you're using matrix keyboards, it really helps a lot while being easy to learn.

As a passionate user of Colemak-CAW (CurlAngleWide), yes, I'd say it's just about perfect. ;-) I think you'll be happy with it. Also, as a locale user myself I must say I find it attractive to have the special letters in the middle of the keyboard. I prefer hitting the []œ keys in the midlde for my æøå (in your case äöü) letters.

But if you don't want to cross that bridge just yet, you can quite easily make your preferred ergo/non-ergo variant of the De layout (minus the images)!
1) Copy-Paste the layout folder and rename the result to what you want, such as 'Cmk-eD-De_ISO_Angle' for German.
2) In the layout.ini file in that folder, edit the remap fields to represent the new setting. In this case, 'CmkCAW_ISO' → 'Angle_ISO'
    - For non-DH layouts, Extend uses the same remap as the layout; for Curl(DH)/CAW you need an _ext remap for Extend.
3) Now, if the PKL_Settings.ini Kbd/Curl/Ergo/Locale settings are right – in this case, ISO/--/Angle/De – you should get the variant you wanted.
3) If you want updated help images you must get Inkscape, set the HelpImageGenerator to its path if necessary and run the "Create help images..." option.
    - By default, the HIG looks for Inkscape in C:\PortableApps\InkscapePortable\InkscapePortable.exe, so you could just put it there and go.
    - Otherwise, the HIG settings are found in PKL_eD\ImgGenerator\PKL_ImgGen_Settings.ini; hopefully they all make sense.
    - To see the menu option you must have advancedMode active (in PKL_Settings.ini).

There are quicker and dirtier ways of tweaking your layout. This is the most correct approach. Since I type more English than Norwegian these days I just use the AltGr versions of my letters, but for my language they happen to be on the []œ keys! ;-) I also find the Umlaut dead key on semicolon easy to use, so I can type German quite well from the standard Colemak[eD] layout! But of course, if you type long stretches of German that'll get annoying.

Hope that makes you a happy camper! ^_^

Viel Glück dabei! ^_^