Can't get past initial Bootcamp-Windows 10 Boot-up on MacBook Pro (early 2013)

Hello, I’ve got a problem.

I tried to install Windows 10 now for 3 days via Bootcamp-Assistant 6.1.0 and am stuck at a boot-loop due to an igdkmd64.sys-error, even before the installation could finish.

Only time i could get windows 10 to work, was when avoiding BCA and using Disk Utility to create the partition and installing manually via USB-stick.

But then i couldn’t get the cirrus audio drivers running, so after browsing about another 100 support-forums, also here on apple-support, i tried again my luck with the BCA, to no success.

I’m on latest Mojave Beta, Mac Book Pro retina 15” early 2013.

Windows 10 iso is the latest 64bit Win10 Pro from Microsoft (1803x64) but i initially also tried a german 1809 - same result.

BCA keeps installing Windows Support-Software on the OSX-reserved-partition (i assume) and i cannot acces the malicious drivers to prevent them from being installed.

Don’t know what to do, anymore: BCA and EFI internal, or EFI via USB? Manually (without BCA) and EFI (usb-stick) but no working Audio-driver? Or try the DVD-route?

I’m frustrated and would be so grateful for any help!