Theoretically, as long as you keep the xml structure intact, everything should be fine. But then again, I just spent last night troubleshooting some of my own 'handiwork' editing the Advanced Output .xml files. And I was pretty confident I knew what I was doing
Once you get it up and running though, stability shouldn't really be affected. If it survives a thorough test in a safe environment, it's highly unlikely that it will flake out on you two months down the road.
Nice workaround btw! XML FTW...