If you can focus on that, in the long run you may be happier.

What would be wrong with mounting two (wired) speakers up high pointing down and out toward the primary seating area on your deck? They wouldn't have to be as expensive as the Bose, which are overpriced and have been for years. Youtube has probably two thousand videos on how to mount/hide wires, including outdoor setups. The receiver would be located inside along a convenient wall.

For easier control of your AV receiver, just find a newer model with iOS app that can control the whole shebang. Onkyo/Denon/etc. do offer such methods to operate the receivers. So all that would be needed was a local wifi network (for AirPlay too).

Polk Audio (Atrium?) was one model I remember had decent sound for outdoors- nothing magical about Bose. About 1/4-1/3 the price.