Windows HVM dependent on mounted device

After a while of troubleshooting QWT on my Windows HVM’s I got used to booting with the QWT iso a lot, --cdrom flag.
Now the HVM won’t start without me having the iso mounted as a loopback device in my running build environment, where I built it.

~> qvm-start gpu_WHVM
block device Build:loop0 not available

I’ve tried detaching the drive in Windows, but it still wants it back on the next reboot.

Still can’t figure out how to launch this VM without the QWT drive being mounted.