Maybe you could make an applet in IFTTT for this. Just a simple notification when you leave a location (home) to check for your smartwatch. You could probably build an applet if you leave a location but your smartwatch doesn’t, though it looks like they have a pro/paid version you’d have to subscribe to.
Actually, it looks like Apple has this option built in.
https://support.apple.com/en-us/HT212765