HTC EDL Mode

Not sure to be honest. It may, assuming the exploit to extract keymaster key will work on this device. Testing it on a spare device would be a good idea first.

Other than that, you could at this point try to create yourself a boot image with insecure adb running as root. This way, assuming it won't throw an encryption error, you would get a phone booted into Android, with ADB enabled and running as root. You could also take a look at "android universal" project (it's on github) that would make similar boot image, signed with fake key, enabled adb (with your key so it's paired) and hidden root shell.