Out of curiosity- how much time have you actually spent in high heels? When you are standing, your weight is still distributed between your ball and your heel. It isn’t like you are on your tip toes all the time. In a wider heel like shown on that boot, if you stumble, you still have plently of surface area so that you can post your foot down straight (though you have a longer lever to torque your ankle if you catch the heel).
A boot like that would provide plenty of confidence that you are firmly on the ground if you are comfortable in heels. For myself, I would be worried that it would change the dynamics of reaching the shifter and brakes too much for me to be comfortable. However, if that is what I rode in all the time, I’m sure it would be fine.
BTW- when I walk in heels, it is heel first then toe. Other women may walk differently.