Hi Nader, and welcome to CoffeeSnobs.
You can turn your pressurised group handle into a non-pressurised fairly easily just with some simple disassembly. This process is also reversible if you ever decide to sell and want to make it original.
A search of this website will give you the information you need to do this.
as far as I know the VV is unique with its group handle and the best bet for a true bottomless would be to cut the bottom off a spare. Im not sure where one of those could be obtained. Maybe email the sponsors and see what they may have in stock?