Valves for hydragas spheres

Planning to weld in valves for the nitrogen side. I know that most ppl use 1/8 schrader valves with high pressure core (3000 psi). So time ago, in this forum, someone tried Valprex valves for citroen c5 but than I also have to buy a filler adapter as not of the nitrogen fillers will have this valve connextion. What do you think, which option is better?

Unless you are a highly experienced welder I would buy some already done.