Would it work if your enable script was something like
- Stop AAS and BT
echo "Proxies=android.hardware.bluetooth@1.1::IBluetoothHci,android.hardware.bluetooth@1.0::IBluetoothHci/default" > /opt/appsupport/etc/appsupport.conf.d/99-passthrough.conf
- Restart BT and AAS
And disable script could be something like enable script, except in step 2. you delete that previously created config-file?