I don't know how things work in Germany, but in the US all prestigious universities will consider, and have admitted, homeschoolers or others with nontradition

I don't know how things work in Germany, but in the US all prestigious universities will consider, and have admitted, homeschoolers or others with nontraditional transcripts. This school would be no problem at all for a US university as long as you're able to demonstrate that you can compare well to others in what you've accomplished or learned.