While I can understand the reasoning for a custom charging port to keep the size of the SmartWatch down, it is annoying to have to carry another custom port to USB cable around with me when travelling.
But the stern steerers retain a passionate following even today for their impressive size and beautiful detailing, including varnished woodwork and custom-designed metal hardware.
If you are likely to get a few more orders for that exact size later in the year, then you could use the custom order as a base for a larger production run now.