https://www.amazon.com/Euler-Elastic-Armband-Companion-Compatible/dp/B07VWC4SH1
This looks like it could be a good option...
This doesn’t solve your specific needs, but I use something similar to this to wear the watch on my bicep. It doesn’t track quite as well as on the wrist, but it’s comfy and keeps the watch from being in a vulnerable place.
If you need the wrist size, order this for the small Apple Watch (38/40mm). Works perfectly!
https://www.amazon.com/Euler-Elastic-Armband-Companion-Compatible/dp/B07VWC4SH1