Keep your number field, but use the calculation field solely for display. When you need to refer to the value 0 or 1, refer to the original field.
if the 0 and 1 are into a NUMBER type field, you could format it as boolean and give it the display option to show an √ or x .
While in Layout Mode, select that number field and go to see how you could format it.
Thanks PhilModJunk, that was simpler than I anticipated.
Thanks raybaudi as well.