I'm kind of making one.
I got ( disassembled in bits) a MM US Sub which, as I'm sure you know, is effectively an American made Stingray with a slab body and crappy textured paint, and have currently as an experiment stuck a far east made Sub maple neck on it, ( jazz nut width as mentioned in the vid )
.. the neck that came with it I wasn't overly keen on, didn't like the width, profile, or anything really. Plus the crappy paint finish was damaged ( which I've now stripped btw).. I much prefer maple necks over r/w too, and the sterling Sub neck came up on the forum recently at a good price, so I snagged it for the purpose.
Something I did find was that the neck's heel is about 3mm deeper than the original, and as a temp. bodge to try it, I've put shims under the bridge saddles, otherwise the saddle grub screws would be virtually out of their holes.
If I go with this neck I'll plane the required amount off the bottom of the heel to the same dimensions as the original neck. I've strung it up and will play with it for a bit, and let the neck settle, if I like it I'll proceed as above.
Obviously this version already has the pukka MM PU and pre amp so needs no further improvement in that dept.
Here's an unfinished / work in progress rough pic..