This post literally saved hours and hours of gameplay for me...
I experienced a BSOD crash today which led to a NRE "Object reference not set.." / corrupted save file. I stupidly did not have a back up for my main save (tough lesson to learn, but i will never make that mistake again!).
Well I managed to repair the main.ttw and main.ttw.bak files by copying them over from a same world new save... so yea I lost all of my character progress and the best of the best gear I made/found, BUT using this workaround I managed to reset the actual world POIs while still saving all of my base progress, my massive farm, all of my stores of stashed gear, weapons, goods and everything else I had at my base.
So yes, I'm essentially starting a fresh lvl 1, but with my bad ass base, and all of the bells and whistles of my original character !
Thanks for taking the time to post this workaround !