i need the same sort of function in my work flow.. i have 2 work-arounds
i use a gaming device like this.. and have the rubber wheel at the index finder binded to “+” and “-“.. zooming out.. then in again.. while premeire zooms in it focuses on the CTI.. very very useful but obviously take a little getting used to
https://www.weloveshopping.com/shop/client/000034/pyi072/N52te.jpg
another function without a device is to use the “\” key.. defaulted to zoom out fully.. if you double tap it.. premiere will zoom fully out then back in at the CTI
hope this helps.. the Numpad suggestion has greatly helped me with another workflow idea.. thank you Peter