How can I allow incoming calls to only vibrate when I have Do Not Disturb turned on?

Currently, Do Not Disturb fully disables incoming calls, or only shows a silent notification. How can I just make it cause calls to vibrate when I have Do Not Disturb turned on? **My real goal:** I do deep-thinking work as a software developer. I need 4+ hr blocks of time undisturbed so I can do deep work. I'd like to start each work day by turning on "Do Not Disturb" mode for 8 hrs, but I need to still be notified of calls--just via vibrate is all so it's less-intrusive, in case it's a doctor's office, the [car repair person fixing my brakes](https://mechanics.stackexchange.com/q/88265/71510) , my wife with an important message, etc. My phone is Google Pixel 5 with Android 12.