Simple solution for you: buy a metronome, fasten step-tracker to it, then turn on metronome.
Occasionally stop the metronome to read the step-count, adjust the speed & time to hit your step-target.
Repeat daily or weekly to hit your target, then share the data with your plan.
Meanwhile you can watch TV, read a book, relax in a hot-tub, etc.
If a metronome won't swing with tracker attached, perhaps a paint-shaker?
Or build something with motorized Lego or Erector set.