NO there is an easy solution! Go to the Control panel and select the music panel (I hope that is what it's called) press the symbol on the to right, then you can select which "speakers" to use!
Huh? Not following, sorry. EDIT: OK, that’s weird. So pulling down the Control Center, with my AirPods connected, I see the little symbol where you can choose an output (in my case, the AirPods, and the Bose Mini SoundLink). Then, I select the Bose and bam, sound from the Bose. It’s like I had to trick with the AirPods first or something..... Thanks Momof9!
And, for some reason, I can’t get any BT speaker to work with the HDMI cable plugged in. My AirPods work just fine, but I have an older Bose Mini SoundLink and a brand new Bose Mini SoundLink Color II and either work with the dongle/HDMI cable plugged in. If I remove the dongle, no problems. Hmmm......
EDIT 2: OK, so it appears that in order to get a BT external speaker to play with the AV dongle attached and an HDMI cable attached to the dongle, I first need to fire up my AirPods, start the music/video playing, then pull down the Control Center and change the output from the Music tile. If I unplug the dongle, I have to do that again, the setting doesn’t stick. Anyone else have this going on?