Mixing is hard, using different sources for different sorts of data is likely fine.

http://wiki.osmfoundation.org/wiki/Licence/Licence_and_Legal...

You can however, put separate and distinct data layers on top of your map, such as icons showing specialists points of interest, routes, track logs, shaded areas, contours and the like, then Share-Alike does not apply to these elements as long as they do not interact with the map underneath.