@Nzgrant, others will have better-informed replies, but from a fellow luddite: no EWOF means probably no insurance, which is a liability for the marina plus anyone you bump into/set alight/other. Is there a breaker switch on the multiplug box? Nevertheless, the simplest interpretation of the rule is "no EWOF, no permanent connection" (although a wider literal reading is "no EWOF and/or no insurance equals no berth, regardless of power"). A tagged lead from the pylon to a battery charger and maybe one other device, and plugged into the pylon only while you're aboard, is probably a minimum.