House purchase - Proposal for financing model correct?

Zaba, don’t be crazy. First, it’s possible without intermediaries, second, there are plenty of banks that don’t work with intermediaries. My bank, a Volksbank, knows me, I’m a member, didn’t even ask anywhere else and received 1.25 nominal, 1.29 effective. However, we only borrowed 100 out of 270. They only went into the land register with 50 and accepted an insurance policy as collateral for the rest. By way of silent assignment.
If you have a good bank and not just some online institute, you don’t need such financial jugglers…C and A business dress, leased BMW 3 Series, gel and Davidoff cool water scent…nope, they don’t come into my house. Karsten