There are some wiring systems that somehow reseble your ideas:
230V between phases and no neutralin the supply (also called 230V delta). Houses are then fed two phase wires, neither of which is necessarily anywhere near earth potential. This is used in at least in Norway in some locations. Light switches are double pole here.Some places in Belgium three phase 220 across the phases (= 127 phase to earth/neutral, 230V Y output on transformer) is used on older domestic dwellings (new installations are 400/230V 3 phase, neutral, earth). For this reason all Belgian fuseboards (whether actual fuses or circuit breakers) protect both current carrying wires irrespective of supply type.