Found this video today and while this was interesting to see how you remove attachments from a Gerber MP600 and MP650, if this had taken two individuals that seem to be more adept to multi tool this long, this is why I'd be skeptical at best about modifying any of my multi tools. Especially those I use for EDC. This is a long video, but fairly interesting video none the less.
Title of the Youtube video is named Hacking a Geber Multi tool.
While this task itself doesn't seem to be that challenging, this does appear you need to have patience, follow an order of operations and need to have some precision in doing so. That said, I now can see why Gerber does not sell individual parts as I am willing to bet this may or may not violate the 25 year warranty. Along with liability issues as well.
Modifying a Spanner drive screwdriver might also work instead of the tool he used, but I am willing to bet that was a custom made tool as well.