Smokey,
I don't find the price of this item objectionable because I'm sure it is a quality made tool and being for a very low volume market, it is not worthwhile to make it on a more industrial scale to make it cheaper.
Please understand I can only refer to my experience with added "picks" on a couple different types of repro tools. Personally I don't like them because if your hands are sweaty or cold, it seems like the darn picks "get away from me" and I get stuck by them in the hand.
I don't see the reasoning of having to hope my grip holds the pick away from stabbing my hand while I'm concentrating on using the "turnscrew" (period name for a screwdriver) correctly so I don't bugger up the screw slot and turn the screw as I need.
Nothing wrong with not being very handy and wanting to buy something period correct and useful. This could be a problem with this tool, BTW, because if the turnscrew blade tips don't fit the screw slots in your gun, that means you will need to thin them down or file open the screw slots on the heads of the screws.
You DO need some kind turnscrew or other tool in your shot pouch to tighten loosen at least the top jaw screw on your lock and it seems at least a one blade turnscrew is mentioned often enough and especially found so often in the archeological record, that it had to have been a common tool.
Personally, I would want a turnscrew that fit both the top jaw screw slot correctly and also fits the side plate screw slots correctly, but many if not most of those screw slots are different on modern repro locks.
In your case, I would recommend using modern screwdrivers until you come across repro period ones that you can actually try on your lock screw slots and test that they fit the screw slots correctly, or have someone else make or modify a tool specifically for your lock screws.
Gus