Actually even Bing carbs - and Amal Mk 2s - had these plastic hoses from the seventies onwards and I hated this even then. But really the only function is to vent the float chamber. So I had a close look at the China carb above in my photos and yes, you can cut all connections and bin the hoses. Seems this is an environmental thing since for all these vents.
I have not tried one of these , not for a Vincent of course. But I guess these will work - unlike some dated Amals, as you will know better from own experience. After all, Chinese or Japanese companies have a LOT more knowledge about engines compared to all other worldwide companies as they have produced many , many more millions of bikes in three decades than all other brands added up from day one of Benz or Daimler ´s times.
Vic