Is there a Powersave for Wii U

Saves are contained on the Wii U or on an encrypted drive and the encrypted drives can not (yet) be accessed from a PC, although it's theoretically possible.
So you will need some way to extract the saves, which involves homebrew.
However, you don't need to modify the system in any way if you use the browser exploit.

 

You just need HBL v1.4 on your SD card: https://github.com/dimok789/homebrew_launcher/releases
Along with the homebrew you want to run (in this case that would probably be Saviine: https://gbatemp.net/threads/release-saviine-wiiu-savedata-tool.399833/)
Then go to http://loadiine.ovh on your Wii U and tap the button there to launch HBL.
After that you just follow the instructions in the Saviine thread.
Once you have the save extracted you can edit it with a save editor.
Save editors don't exist for all (or even most) games though, you'll have to have a look around to see if save editors exist for the games you want to cheat in.

 

None of these issues you reported have anything to do with modding or custom firmware (CFW).

I don't know what you're talking about when you say "CCW"