I'm in the same vat. I want to do some yellow lettering for WM diesel decals, and some gold/buff for passenger cars. I'm wondering if you got an ALPS print in white, then do the same art in your translucent yellow on the lazer, and just use two layers of decals...??? Tom's suggestion would work if you can precisely match the car color, and if you're off by a wee bit, some weathering could blend it in.
It's either that, or we sit by the phone waiting for Micro Scale to call to let us know they're doing what we need...
Lee