Thank you for your honest feedback. As we approaches our funding goal, you can see that we will soon be provided PolyUrethane Strap which can be used for diving for free with all watches. As for metal bracelet, we have yet to reach the MOQ to order the metal bracelet to go with the watch. We do however have a prototype metal bracelet to go with the watch (See picture below). Personally I like the metal bracelet too but currently, we won't be able to provide that for free yet at the current pledge level.
Definitely considering to use Hex screws as you mentioned to replace the current screws you mentioned. Didn't find it cheap looking since IWC or JLC use such screws head for some of its watches. I'm also talking to the supplier to revise to a screw-down caseback instead. Keep you posted. :)