I made these tools a few years ago and use them quite often. The T-handle flat screwdriver has found a new use......I use it to spread the kickstart lever to get it off the shaft.....works better than a long plastic handle screwdriver.
The cut down Philips screwdriver has one job only...to make the float bowl R&R much easier. I thinned it on the lathe to make it easier to use in tight spaces. I put a big dimple in the end so one hand can hold the float bowl and screw driver while the other hand does the turning....see photo. I fiddle with carburetors all the time and this is the first tool I grab. The only thing to improve it would be a magnetic tip.
The idle adjuster screw for Mikunis actually takes several steps to make. I make full use of the idle screw for starting and idle, that's one of the big advantages of the single carb. As it warms up and the idle increases I can easily reach down and lower it while riding. I've sold maybe 15 of them.
As you are well aware of, these bikes can can be very aggravating and anytime I can reduce the frustration with a special tool I'll do it. (for example...after two nights trying to install a kickstart spring on an A65 I made a tool that popped it on in a couple of minutes). If the job is a real bear I'll put it off to the last minute. If a special tool makes it easy then the job gets done.
If the tool stands the test of time I'll offer it to Norton people. The price is about $5 above the cost of materials.