I've had multi-way splitters from Land Rover Spares suppliers such as Paddock Motors and John Craddock - but they don't have the BMW 10mm x 1mm threads.
Any yard that wrecks jap cars will have a couple of hundred or so still bolted to the bulkhead of the semi stripped cars they will let you gave for next to nix.
The one in the photograph had female to female adapters for the lines which you might find a bit harder to find in a wrecking yard.