We're seeing more good concealable holsters for light/laser mounted pistols than ever. I've had good luck with Galco and Blade-Tech, and there are others. However, most of these are geared for the two most popular brands, SureFire and InSight. Every light/laser module seems to have a slightly different shape.
See if you can bring your unloaded G20 with Veridian light into a well-equipped gun shop or police equipment shop with lots of holsters in stock, and request permission to test the fit in the holsters they have on hand.
Another option is to simply call Veridian's customer service department, toll-free, at 1-800-990-9390, 8AM to 5 PM Central Time. It has been my experience that the manufacturers of this type of product stay on top of what accessories other manufacturers are making to accommodate their product.