Is your bike bluetooth enabled at all? Might be working checking out if it’s compatible with this app: https://www.qzfitness.com/ which could then send the metrics to Startona
I've just had a look for ways to adapt it though, and found BitGym [0] which doesn't require a connection to the bike at all - you just place it on the handlebars and it measures your cadence with the front-facing camera somehow. That would be a neat feature for Startona. Maybe you could even measure it via the accelerometer? FFT the lateral motion of the device to find the frequency of movement? Maybe it wouldn't be strong enough but it would be an interesting experiment
You could try to use a Bluetooth speed sensor like the "Wahoo RPM Speed Sensor" if your home trainer somehow allows you to fasten it to it's flywheel - if not, you would still have the option to put your bike on a cheap roller. That way the game would work, but you would only get a limited experience since only the high-end rollers support erg mode. At that point, you have come full circle and it may be cheaper to opt for an entry-level hub trainer like an Elite Suito.