I considered this, but decided it wasn’t worth the clutter cost since there’s a systemwide setting built into iOS. https://twitter.com/computerality/status/1041775404061798400
Overcast 5 is a major update that brings a new Now Playing screen, Siri shortcuts, a standalone Watch app (!), and more.
My full review, including an advanced custom shortcut (with video!) https://www.macstories.net/reviews/overcast-5-redesigned-now-playing-screen-search-siri-media-shortcuts-and-more/