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Shore power is 230V - 50 Amp standard North American marina 4 wire (Red-hot, Black-hot, White-neutral, Green-ground). The vessel is wired with split phase output of 240/120 (same wiring scheme). The 7000 inputs and outputs only have L,N,PE. Can I somehow wire/jumper the Victron 7000 to accomplish this and get the galvanic protection?
No. You need a transformer with a center-tapped secondary winding. The input does not need a center tap if it is always fed from 240 volt split phase. However, some power (at least in RV parks) is two legs of 3 phase so the voltage from hot to hot is 208 volts. You might also want to accommodate 120 volt shore power. All is possible with multiple taps on the primary (input) side of the transformer with taps for 240, 208 and 120.
You could place an autotransformer down stream of the isolation transformer but a single transformer would probably be better.
