I have an old Master Grip 396PS designed by Pat Simmons of Alien Wedge lore. In a Minimalist bag one could carry one of these for 100 and in, one wedge and your other clubs and even cut down more on clubs used. Once you get good with a specialty club for various shots you need even less. I can use it hinging hands for longer higher shots and like a putter locked wrists for chipping. All is all even for a purist these specialty clubs for hackers are more accurate. I may try it this spring to strip down amount of clubs to 6.
BTW bunkers on muni courses I play in general are hard packed and terrible sand so I chip out of them now the 396PS is probably as good on those kind of shots except where you need to elevate over a high lip.