OPTION 6: iPhone Apps (BLE)
Treadmill Smart Speed (TSS) https://appyappster.com/apps/ John McManus (member here) developed this for the iPhone and is available in the App Store.
OPTION 7: Android Apps (BLE)
Treadmill Speed Transmitter https://play.google.com/store/apps/details?id=com.bipr.treadmill.speedtransmitter