Congratulations!
https://toolguyd.com/metmo-multi-drive-tool-kickstarter/ That discussion did bring up one point --- the usual way to change blades on a scalpel is to grab it w/ a pair of hemostats with the one hand, then push that hand away from the tool with the thumb of the other hand:
https://www.youtube.com/watch?v=A9-GJb9Inrk