Did something similar a few weeks ago. Client wanted to replace all drink glasses with branded paper cups. Pulled a model off turbosquid and altered the diffuse map to feature the brand color and logo. Lighting all came from the scene piped in as it’s own IBL. Worked pretty well when mimicking shadow changes. This wasn’t high end CG work by any means, but I was pretty excited by the results. Having a simple object like a paper cup helps. Any minor pass work was done using Object IDs. Stingray ambient occlusion and physical shaders were a huge help.
Train does sound complicated, but worth a try. Would object IDs help with breaking out areas for lighting?