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I can leave the tip of my tongue in the post-alveolar position for the l while doing velar c.
So you double-articulate some consonant clusters? Do you manage with words like "scan"?
If I had time, I'd download Praat, re-learn how to use it, and start running out some spectrograms of The Post-Apocalyptic Inventor saying "Knipex" - of which there are many examples
, Gott sei Dank.
I can leave the tip of my tongue in the post-alveolar position for the l while doing velar c. I can't leave it in the alveolar position while doing velar k. Maybe I would be able to do that if I had trained on a language which routinely required it. If you think most Germans can, and do, maintain contact between tongue and alveolar ridge while pronouncing velar stops, feel free to correct the Wikipedia article about Knipex 😉