Hello, I personally have not tried a "wearable" pulse oximeter, but there have been a few small studies of specific devices. But in your circumstances, I would sure be interested in finding one, for my own peace of mind while exercising.

- Here is a highly technical one published recently about wearable finger & wrist pulse oximeters:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8889481/
The takeaway I got after reading it, because others have also asked, is that there are both finger worn and wrist worn devices. As long as you recognize that they have limitations, such as all being off by 1-3%, and potentially needing to go through a calibration for you, these should be helpful. As of 2020, a small study concluded that there was too much variability for smart watches to be considered accurate, but that's a long time in electronics so that may be different.

If I were on a quest for a wearable oximeter, I would ask at cardio rehab if they had a recommendation, or even one I could try. Can you contact them for help?
Sue