You could buy the extension ring (or use one from a P3, if you have one, along with any extended cap and you can run all size batts with the different configurations. The rings are a bit pricey at 12.95 before discount. Is this what you are looking for?
If I could find a Provi Mini with the extension ring to allow for 18490/500 and the extender cap to allow for 18650, I'd bite. The ability to run 18350/18500/18650 would be DIVINE. (Yup, I got my Dragon and Glovari from the specials page as well)
They only have black, polished and satin silver so not sure what color you would need.
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