I had forgotten that the OEM kit is the complete factory cable (including the fusible link and cables to the alternator and jump post) that eliminates splicing, which is a 'clean' way to do it, but does require the just-as-troublesome disassembly and unwrapping/rewrapping that you noted.
Some searches turned up Jegs as having the QuikConnects as well as a similar one by Moroso, but I get the impression that both of those are only made to fit 1 or 2 ga. cable. I would think they could only work with smaller cables by offering different size nuts (ID)
You might call QuickConnect to see if they have them to fit smaller cable, and maybe they will send you a positive terminal with smaller nuts at no charge just to get you off the phone.
Here's a similar design by Wen that says they work for 1, 2, and 6 ga. - not sure exactly what size our wire is: http://www.amazon.com/WEN-41201-Post-Battery-Terminal/dp/B00I4WZ2LI/ref=pd_sim_sbs_263_3?ie=UTF8&dpID=41%2BZ8-O3WTL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&refRID=0W54HAHNV83VZR6NT5BX
You might look at some of the Big 3 How-Tos and discussions. It seems I recall seeing some aftermarket battery terminals that were impressive, though, again, are they going to work only with larger cable wire?