This is possible. Here is an example:
What you are seeing here is OpenStreetMap, being rendered from a WMS server, with a dual-axis and multiple marks; showing UK regions "Scottish Borders" and "Perth and Kinross". The Ordnance Survey Shapefile was brought in using Richard Leeke's "shapetotab" tool. If you like, you could upvote my idea, "crowd sourced WMS server".