Changing /any/ SMD chip has already been discussed since N900 days, especially the eMMC and SoC.

tl;dr version of every single discussion on this already:

It's possible, but incredibly impractical to do so unless
a) You can obtain a single part for cheaps, and
b) You have access to $$$$$$ tools to properly do the swap.

You'd probably have to be a very bored EE to do this instead of buy something else.