It is generally not recommended to bypass or tamper with safety features on appliances, especially with microwaves. The monitor switch, also known as the door interlock switch, is an important safety mechanism that prevents the microwave from operating when the door is open. By disconnecting or bypassing this switch, you are effectively disabling a safety feature.
Opening the door while the microwave is running can pose serious risks. Although you mentioned that you are now careful not to open the door while it's running, accidents can happen and you may have others in your household who are not as careful as you are, and it's important to consider the potential consequences.
I would instead recommend replacing that switch. If you have your model number I can find and recommend the part that you'll need and (maybe) find a guide to walk you through it.