I hear you. Most Bluetooth speakers are made to be portable, hence I am not aware of any that have an auxiliary out. i think in 2017 we will see a new class of Bluetooth speakers aimed at the Dot community.
In the mean time, and just for general consumption since others will be reading this thread, the $35 DKnight MagicBox II isn't a bad choice. It is not going to break the bank while looking for the 'perfect' speaker, it sounds good and is always on. I do not have that second delay in sound while it wakes up.
The other solution I was looking at was a Vizio sound bar. There is a way to keep it from going to sleep. But as jiminathens suggests, you might be better of with a Bluetooth audio adapter in the mean time.