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I am following this thought, as I am interested in doing AN/DP; but not interested in diving doubles. I do dive with redundant air and I have no problem slinging a stage btl in addition to a pony.
i just looked at course standards for AN and DP and doubles are not required, just cylinders sufficient for the dives. With that said I have no idea how you would do AN/DP level dives without doubles. Even with an HP133 you have 133.5 cuft of gas. Using a common gas planning methodology and rule of thirds you plan to have 150% of the gas you need and then only use 2/3 of what you have (1/3 out, 1/3 back, 1/3 just in case). So the max gas you would plan on using is 133.5/1.5 = 89cu ft. Using rule of thirds you would only use 60 cuft of gas total to get to either surface or next available gas. Using an RMV of .75cuft/min you are only talking about 15 min or less at 140 ft; not at all practical.