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I'm now looking locally for a 0,25 Ohm BR to install

An option if you dont have the exact ohm 2 terminal "single" ballast is to use the OE 4 terminal "dual ballast connectors (2 white pieces with a blue loop on one end & solder em in and add a blue loop on the other end to make a parallel circuit & then mix and match (2) 2 terminal "single" ballasts side by side (they fit) till you get the ohms you want or very close to it (you do have alot of leeway as already covered). the coil sees the total reduction thru the parallel circuit & ohm each combo end with the blue loops till you get a combo (ohms) you are OK with

live every 24 hour block of time like it's your last day on earth