Sorry, neither of those things are currently possible. The RecordAndPlay audio session does actually force the playback stream to be enabled and to be the same sample rate as the record stream. I’ve put in a large period of research very recently trying to see if there is any way to decouple them in the driver so that OpenEars could use the mic stream without having any effect on playback, and I had no success and found no reports of other successful experiments with this. I’m probably not 100% done experimenting with this since I would also like to release the playback settings entirely, but the last round made no headway after a lot of investigation and it will be a few months at the earliest before it’s possible to delve into it again.
The sample rate that the driver sets for the mic stream is the only one that can be used with acceptable recognition results.