Hi,
Let me Know your requirement for this project.
For smartwatch, I think we can use BLE based microcontroller from Nordic(NRF). For display we can use low powered display. for charging circuit, we can use some Charging IC. We can find it later. Or maybe you have already decide the specification. let me know.
I guess we can finish this project in 1-2 days if we communicate well. let's discuss the detail over chat.
Best Regards,
Rijal