>If I could convince them that I would let someone kill me without defending myself because I categorically reject violence for any reason, they might consider that a conscientious objection.

That is a complete fantasy of yours. Political convictions are explicitly stated as a valid type of justification for conscientious objection by the Act on Conscientious Objection to Military Service. It even states the reasons do not have to be logical or objectively comprehensible, which easily covers your "I'm not opposed to all violence in all theoretically cases, but I fundamentally reject service for the German state".