It's common enough but in practice, using the faceplate of one manufacturer with the switches of another one (and often, even another range of the same manufact

It's common enough but in practice, using the faceplate of one manufacturer with the switches of another one (and often, even another range of the same manufacturer) never looks good. In fact I think that the very example in this page, at the bottom, with a silver faceplate and plain white modules, shows it quite well.