Not sure whether this is the right these to ask the question.

I have a chest strap heart rate monitor. I would like to have a "dummy" fitness tracker that can connect to my chest strap HRM just for me to monitor/view the heart rate during running instead of using the HR sensor on the fitness tracker/watch. I dislike wearing watches all the time that's why I opt for chest strap HRM instead of fitness band/watch.

One example of such dummy watch is like Sigma id.go watch.

Any recommendations? Thanks