Forerunner 15

Still rocking my Forerunner 15 with heart rate strap and shoe clip for indoor runs.

I use a Garmin Forerunner watch, and it displays heart rate while tracking activity. The reading is pretty visible to me even with slightly foggy goggles but ymmv. They have a lot of models with this capability, so maybe you can find one with a bigger screen. The default heart rate screen also has a colored Zone indicator, if that's easier to see & you're not looking for exact numbers https://support.garmin.com/en-US/?faq=kbOXNev7NS4DQcc3IjAV49

I use Garmin forerunner watch, sync Strava with Garmin Connect and sync Komoot with Strava. It works like a charm.

I got a Garmin forerunner watch and on the mats I use the Garmin hrm pro. Had no complaints while rolling. Just makes it feel like you have a hard sternum

I have a Garmin Edge bike computer and chest based heart rate because I like to see my speed on the handlebars rather than having to look at my watch. It also navigates for me on more adventurous rides and race courses I'm unfamiliar with. For local social rides I just track on my Garmin Forerunner watch.

A Garmin head unit. You could buy used to reduce the cost. I do ride wearing my forerunner watch, however it is purely for heartrate (linkeded to display on headunit) In reality you could buy the headunit and an inexpensive chest heartrate monitor such as magene. I do however like that my watch provides lots of other daily data such as resting heartrate, steps and so forth. There is benefit to headunit + basic level sports watch.

Congratulations!  I use Garmin forerunner watch.