Kind of progress on the shell - these sellers are had the adapted MVS in an AES shell for sale at outrageous prices
Plain black
https://www.aliexpress.com/item/1005004699275681.html
Plan black and translucent grey
https://www.aliexpress.com/i/1005004490899386.html
But if these guys are selling them for outrageous prices that means someone, somewhere is selling them for less-outrageous prices...
From what I've seen these are not AES sized, just shaped. I'm not aware of any after market AES replacement shells.