Currently in iOS 13, their are some speakers, which use a specific Bluetooth chipset, or codec, which allows for Voiceover speech to be directed to the iOS device/handset, rather than to the Bluetooth speaker for the world to hear. While more devices, or a complete over hall may be coming in iOS14 to have this same desired option, this is not yet known (public knowledge). This post is meant to be a list of speakers which are known, which may be a good resource for helping one to choose which speaker to purchase which do not stream Bluetooth Voiceover speech, while the audio rute is set to the default. If you have a speaker to add, please leave the brand and model in the comments.
Please no listings which you haven't tried and are not sure of.
Please no extraneous off topic conversation or wish lists within comments to this post.
List starts here:
Amazon Echo First Generation