Yesterday I accidentally destroyed a masterwork healing kit by targeting it with a normal one. Because I didn't have any idea how to transfer items between kits, and made a bad guess when trying to fill it. Then my surgeon was sad.
1: Could we have a set of usage instructions in the kit description, and a warning of "If you target another kit, that kit WILL BE DESTROYED".
2: Rather than just destroying the kit, could using a kit on another kit also spawn an empty kit of the appropriate quality level? That way you can't accidentally destroy loot while trying to reload it or on a misclick. The script reads the ID of the targeted item, destroys it, applies the number of herbs to the item you used, and then spawns another replacement empty kit.
3: Alternatively, could you disable filling kits from other kits, and add a Unique Power Self Only that spits out 10 Herbs at a time, so we can empty it the long way?