I've swapped MIA, MIJ Squier/Bullet necks around before(even MIK) and it's hit or miss. Ultimately I'd have to say that when it comes to MIJ Fenders and Squiers the OE neck is usually tough to beat...they're seldom bad and the fit/finish is always very good.
I've never dabbled in MIM stuff. You should report your findings and post pics.
So even though the sky is the limit, there are limits to what we'll call "sky".