7\8 inch neck, 300 bar DIN manifolds are available both used and new ex: (Buy XS Scuba Thermo DIN Manifold 7/8-UNF 3500psi | Divers Supply) Note: I'm pretty sure that picture is wrong as it seems to show 200 bar DIN convertible with 3\4 neck threads.Does that mean it would not really be possible to turn these into twins later when I get there?
Thermo - Isolation Manifold - 7/8"-14 UNF Inlet Threads - 300BAR DIN also wrong picture