Re: https://firmwaresecurity.com/2016/03/01/vim-port-for-uefi/
There is a SECOND port of Vim to UEFI!
This one uses this library:
https://firmwaresecurity.com/2018/01/08/torito-c-library/
https://github.com/JoaquinConoBolillo/Visual-VIM-for-UEFI-Shell