If you want find a module to instead of the microchip BM64 bluetooth module .
And you want bring the cost down.Feasycom have kinds of audio bluetooth module can replacement BM64,let is have a quick look !
Features of BM64:
Bluetooth 5 Certified
On-board Bluetooth Stack
Protocol :HSP, HFP, SPP, A2DP, and AVRCP profiles.
Feasycom bluetooth module :FSC-BT901 FSC-BT906,FSC-BT909,FSC-BT802,FSC-BT906 the firmware can totally replacement.
But if you only need BT5.0 ,and then you need small size ,the most suitable module for replacement BM64 it is BT802 .
For more details ,feel free to Contact Feasycom .