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This is going to be expensive, but you can buy an Apple Watch together with a cheap refurbished / secondhand second gen iPhone SE (not the newest one, which is the third gen) to set it up. iPhone doesn't have to be in a good state. Fantastic app ecosystem on the watch, all health and activity data is end to end encrypted and any third party apps have a very strong permission model where you have to give explicit access to each aspect of health data with separate permission for read and write access. If you buy the cellular model you can use it for calls when you go on a hike or run and want to reachable but leave your phone at home. Just make sure you have a plan that is compatible with it, stick your sim in the iPhone to set the watch up and then stick it back in your Pixel. Otherwise the one without cellular also works great for health and activity tracking.