If you are a German resident, you can only travel on two days in Germany.

The €49 ticket might be better, although you can't use IC ICE etc.

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Wenn Sie in Deutschland ansässig sind, können Sie nur an zwei Tagen in Deutschland reisen.

Das 49-Euro-Ticket könnte besser sein, obwohl Sie IC ICE usw. nicht benutzen können.

€49 ticket for: 

Osnabrück - Hamburg - Osnabrück
Frankfurt - Saarbrücken
Aachen (or Essen) - Münster

Then buy a regular ticket from:

Saarbrücken - Paris
Paris - Rennes - Paris
Paris - Aachen (or Essen) -  (Thalys)

It depends on your route. It’s possible the Carte Avantage from SNCF will save you some money.

If you use a pass, you would have to pay extra reservation fees on Thalys, SNCF TGVs, or the ICE to Paris. I don’t think it’s worth it.