How to get Recovery without the Hardware key Apprently I am stuck in a known problem the Cyanogen Bootloop.
The solution involves going into recovery, which is not possible since my "volume down key" is physically damaged.

Do I have any options of escaping the vicious Bootloop? Or did I officially brick it?

The model is: HTC Desire HD (HTC Ace)
Try booting while pressing the back key. That will get you into fastboot, and you can access hboot (and hence recovery) from there. 

If it worked try any solution among this..

It depends on the cause of the boot loop 

Wipe cache and dalvik (depending on what recovery you look in different places for these. I think ClockworkMod may have wipe dalvik in advanced). TBH I think this is unlikely to do it, but is harmless. 

If something has been corrupted in the ROM then reflashing the ROM (without wiping) will fix it. 

If it's data corruption then a factory reset will do it.