Plz help me make a motorcycle alarm tracker w/ an old Android phone and tasker! Plz?

Hey Super smart and resourceful xda friends! I have a Motorcycle ('15 Honda Grom) and a scooter (Kymco Super 8. Both are prone to thievery :'( I was wondering how I could use two old Android phones as alarms and GPS trackers for my bikes. I know I wouldn't have proximity sensors at all (or could I?) But the gyroscope in the phone should be good for detecting movement. I was thinking it'd go like this. I can semi permanently mount the phone somewhere on the bikes so as they're not easily accessible/disconnected. I'd have them hardwired to the batt for power and turn off as many background processes as possible to have long standby time. I could also have a 3.5 mm speaker or rechargable Bluetooth speaker for alarm sounds should the phone detect movement. An alarm would maybe trigger a warning chirp and then sound full alarm should movement continue. I'd also like to have movement trigger a SMS to my phone and begin GPS tracking and somehow send it to my main phone. I'd use a pay as you go sim for SMS and data to send me coordinates or data about where the bike is. It'd be ideal to have a Bluetooth low energy fob on my keyring that would activate the system after I leave the vicinity of the phone. So, what do y'all think? Would this be possible with a collection of apps currently available? I know there are already products out there, but while some have GPS tracking... They don't have alarm or vice versa. Not only that but they're usually 0 and up plus subscription. I think the hardest to accomplish would be the sending of location. Please. Please. PLEASE help me out Super smart people of XDA. How would I orchestrate this in tasker and other apps to work? Thank you so so much to anyone that can help :) :) :) :)