This is an example using the Stylus for the XP-PEN Deco Fun L. You get a small flat head screwdriver and pry out the button. The stylus is still functional and there is no need for tape.
If you need the buttons once more just pop it back in and it will work.
With these stylus the button can give problems when writing. Your fingers may slip onto the buttons creating accidental erasing or bad writing. With the buttons removed, you don't have this problem.