Not exactly, I actually can, but I think I shouldn't try making the game reset the world state to pre hardmode, or else It may generate hallow and corruption again, leading to new issues. Maybe It could reset the other bosses status? And add a requirement where you need to beat almost bosses in...
forums.terraria.org
The result is here: Steam Community :: Screenshot :: Long story-short. I opened Terraria to test if my recordings on OBS were working. The result? I played for several hours on this character until this result.