Yeah, you are going to break Forge compatibility early. I won't say what you are doing is impossible, but improbable sounds like a good word.Ugh... by the look's of thing's (those thing's being the code) it appear's I'll have to either completely re-build the current Anvil file or, Create an entirely new format.
The difficult thing will be making it compatible with how mod's work with forge..oh well...
...for SCIENCE!!
Listen, instead of trying to solve a nonproblem, may I point you in a better direction? Minecraft suffers from memory and CPU usage issues. If you were to develop a mod that tackles those problems like Optifine tackles the graphic rendering problems, well, that would be a wondrous, wondrous thing.