Do orcas even regularly occur along the most of European coast? I thought there are few small groups in Scotland and Scandinavia, and very south in Macaronesia, but otherwise only vagrants.
By the way, besides few localized groups which beach during hunting, cetaceans get beached only after getting heavily ill from other causes, and too weak to swim against the action of the waves. So the rescued orca may have little life left. The previous famous beached orca in Western Europe, in the Netherlands in 2010, was deaf (for an animal using sonar, this is an equivalent of blindness) and starved.