1:15 PM
For future reference: Brick Lane Bike freewheels are apparently re-labelled DNP freewheels. DNP manufactures in PRC now and predominately serve PRC markets.
Chances are pretty good that their freewheels on Ali Express are genuine and of their usual quality.
@Criggie however you fill it, you might always notice the edges of that channel. You might have to cover it with something rigid enough. Perhaps a CFC panel you heat mold to the shape?