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Well, presuming you can get your hands on the parts, the easiest way to go on a single stack is with an S&A integral magazine funnel and backstrap. If you can detail-strip your pistol, you can install one of these.
Looks best with flush-cut stocks, though, which is not what the Trojan appears to ship with. But lo! Smith & Alexander sell those, as well. As does Kim Ahrends: