After researching this issue some more, I think the following might be a better solution but more expensive.
All I need to do is drill two holes through my brick wall to run passive speaker wire to the outside where I’ll mount each speaker. Then I’ll connect each speaker to a wifi amplifier that I’ll place in the rear bedroom where I’ve drilled the two holes. Of course, I’ll need to spray foam the hole to keep it insulated. And I’ll install speaker outlets on the inside.
Arylic makes a wifi amplifier that I think works with Home Assistant:
Here’s the model I’m thinking of using: