I have a really cheap way that I use to alert me if anything is happening in my Jeep or with my motorcycle. I bought one of those cheap driveway alarm motion detectors on Amazon for about $30.00 it has a pretty far range and easily reaches out past my road. You plug the reciver in the wall by your bed. Put the motion sensor on the seat of your bike. ( You can just set it on there or Velcro it and take it off when you ride) then throw a cover over the bike. As soon as the cover is taken off, it detects motion and the receiver goes off in your room to alert you. You can turn it up very loud. If you don't have a cover, you can just mount the motion sensor somewhere on bike that will activate when the bike is moved. I've gone a little more high tech and even hooked these up to my home automation at home as well, so that the lights out front will come on, and all the Alexa's in the house will announce that there is motion in driveway or in jeep or wherever. That might be overkill for you, but these motion sensors are cheap and work great. Here is a link to the one I got. It comes with 2 sensors and 1 receiver. https://www.amazon.com/Driveway-Operating-Melodies-Security-Weatherproof/dp/B07YFT27K9/ref=mp_s_a_1_3?dchild=1&keywords=driveway+alarm&qid=1616115498&sprefix=drive&sr=8-3