I have the same problem.
My headunit allows me to switch between "title", "album / artist", "playtime", "clock" modes, but no option to see the artist and title of the currently playing song together. If there would be some option to include artist in the title field of the AVRCP metadata that would be good enough for me.
Customer support service by UserEcho
Double and tripple press mapping could be used here as well. Poweramp allows to skip track with a single press, and album with a double press. Even tripple press is used in some apps.