I’ve dabbled in a couple recently, xTTS v2 in Coqui sounds pretty good and is pretty quick. Especially if you use one of the built in voices. Has a weird “only for non commercial use” licence if that bothers you.

Main thing is the lug width. You could get a few straps on the smaller side and they’ll fit inside bigger lugs, just not look ideal.

Something that can be worth buying in person, even a mall key/watch repair stall would have a variety of types and sizes on hand and can find you something suitable on the spot.