I updated the Metal Slug 2 Neo Geo CD Turbo Hack with a BPS patch to make it much simpler to build. Just apply it to the .iso using beat and you’re set.
http://www.romhacking.net/hacks/4009/
And more info at https://www.epforums.org/showthread.php?102483-Neo-Geo-CD-Mod-Metal-Slug-2-CD-Turbo-Slowdown-Reduction-Patched