Although I have never had the pleasure of experiencing an AQ Dragon cable, it seems to me that an aftermarket adapter plug or a DIY plug replacement are both inferior options, especially replacing the plug yourself.
Regardless of the level of confidence you have in your own abilities, there is almost 0% chance of a future buyer feeling that same confidence. Just to save a few dollars, you end up with an inferior plug and a lower resale value.
I would spend the $250 and send it to Audioquest.