Even if it only ruined one batch of beer, the time and effort you saved by spending $30 on a new one would pay for itself.
That is a good point. You should listen to sensible people. (i.e. not me)
Or you could make that your dedicated funky carboy. I've got my Bretta-PET carboy holding my lambic and I will probably fill it with a Berliner Weisse before the summer comes. You could have a f'd up renegade carboy for experiments, not that that is your style.
I'm sure someone would take it off your hands if you decide to be safe.