This is what I did -> As Matt said, export your waypoint set as a shapefile. Edit the resulting "filename".dbf file, I used MS Excel. Open IMC, view->icon documentation->icon documentation window lists available icons and icon names. Select the icon that you want and do a search and replace in excel to change to the desired icon name. Save and build as normal.
Yes Matt you can do this -> "I think in principle you could just generate your waypoint layer and then include that AT5 file on your card along with any other maps, and it should show on top. "