I could actually do this way : Robodoc->man->pod. I'll give it a try but it may not be elegant and robust enough to be entirely satisfying :)
However "robodoc2pod" would be quite easy and straightforward to write I guess, but docbook is so pervasive that it probably would be a better and more useful choice for a "whatever2pod" tool. What's your opinion? If I have to write a tool, which will be the most useful?