LetsRoll; Unless I'm missing your point entirely, your concept is already utilized in Pat's Easy Change System.
As for Pat's System - I have it on my Massey 241... Works pretty good for standard size/built equipment (Cat I). For other equipment that's not standard, it's still can "hook-up" somewhat like a conventional ball and pin...
Only draw back I ran into was the extra length (about 4 inches), which extended my existing top link to the max... Finding an extra long top link wasn't all that easy and was relatively pricey when I did find one (Tractor Supply).. Further, I also bought/made/built a hydraulic toplink about that time... Finding a "stock" hydro top link with adequate extend length (approximately 34" needed) proved rather difficult. I finally acquired a Cat II and converted it - thus the "bought/made/built...
Still, as for the Easy Change System - - - It's still on my tractor and I plan for it to stay - works pretty well for me...
regards all
dannyb