Spit balling? Less than $100, and likely less than $50.
Three things would be checked: Feeding, firing, and ejecting. Feeding and ejection are inseparable in this instance.
What the kit would include:
Feeler gauges for:
Extractor condition, hook dimensions from the breach face. In my experience, this is the root cause for many issues seen on 1911s. Clearance between the hook and breech face are too close or too wide. A simple 2 piece go-no go set would work. For extractor tension, something that has devolved into "feel" by most gunsmiths would be checked with the chamber gauge. A 1911 extractor should have a finite amount of deflection when engaged. Some argue 0.002, some a little more. Those that say "it should hold up a loaded ball round" lose credibility with me. Same with the losing tension over time because it's a leaf spring - a clear indication that said person really is parroting someone else. Rant off. The difficulty would be in gauging it simply for someone that doesn't have a test indicator.
Chamber gauge: head space and chamber tightness. This is a VERY, VERY commonly overlooked factor in reliability. Kimber and SA chambers are way too tight IMO. Good for accuracy, bad for reliability.
Radius gauges: Barrel throat.
Paper protractor: feed ramp angle on frame. Would have go and no go markings only.
Barrel timing: maybe optional. No reason to re-invent the wheel. Schuemann did a first rate job designing one. No longer in production, FYI.
Add in Yams VERY excellent bench block and armorers tools, and you have a first rate kit.
To define "EASY" - holding business card stock against parts of the gun and looking for light between the two.
(I split this off from the original thread which had noting to do with 1911s)
Honestly, I am the wrong person to ask. It sounds like a genius idea to me assuming it would really work (i.e., provide genuine go/no-go reliability information). But I'm not exactly in touch with the core 1911 user base in terms of what they think is missing in terms of aftermarket support.