It's entirely up to you and really nobody else's opinion matters, but you're getting them because you asked us for help.
For what it's worth, despite what you say above, the most suitable projects to learn microcontroller and Arduino development are those ones for which the microcontroller/Arduino are a sensible solution. Trying to use a screwdriver to bang a nail in is not a good way to learn how to use a screwdriver.
And yes, if you are not put off by this and are determined to press on with this approach then what you're trying to do seems technically feasible, just not particularly sensible.