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You can use the cell phone to initiate the sequence. You just need a more robust controller between with safe fail modes. In my example, using the counter with alarm output to stop the start signal has a risk. If the mag pickup fails the counter will never see engine speed and the crank cycle...

You might be able to use a digital panel meter with alarm output to sense engine speed. A magnetic pick-up off the ring gear is the most common source. Once speed setpoint is exceeded the alarm output opens a relay which can be used to break the start signal. There are less expensive options...

All of our industrial engines have a crank terminate speed. 300 RPM or so with idle set at 600. The starter can roll the engine at 200-250 rpm. Once the engine reaches 300 that indicates that it has overrun the starter. This sequence gives very good starter life with pre-engage type starters...