How to turn off or disable copilot in windows 11 permanently?

You are looking for a simple and safe way to disable copilot - 

In that case, my answer will be a resounding NO. Since you also mentioned ‘Group Policy|Registry’ and classified it as ‘too risky’, you’ll have no choice but to simply remove Copilot from the ‘Startup’ programmes so that it doesn’t ‘annoy’ you.

Anyway: It feels distracting and not very useful right now - At the same time, however, you describe the tasks to be done as ‘simple daily tasks’.

So, the ‘copilot’ can’t possibly be that much of a distraction!

However, if you’re prepared to take the risks – I’d be happy to guide you through it – it’ll be a piece of cake!