Do dads are available from a few sources although they are primarily designed to be an exact fit to a given remote.
Marantz has such a unit for the RC2000's and I'll check to see if it fits onto the Pronto, what a concept in engineering if it does. Else, the other ones to fit all the DSS type are made by a company called Windmasters as I recall. Another thought is that maybe Philips embedded RF into the Pronto and it just isn't turned on yet, but that's only a guess on my part as I haven't looked inside one to find out. If this was true, it would be brilliant engineering.