Personally, I'd say get an Xkey.
It'll allow you to play games from an external HDD and the only thing needed is obtaining the DVD key which can be done with your PC (if it has a compatible SATA chipset) and Jungleflasher.
If you really do want to flash it, you'll have to resort using a Kamikaze hack or sputnik hack to flash the DVD drive.
Again, Jungleflasher is the tool you'll need.