Is there any way to encourage 3000 BC England to pay more attention to Celtic Dublin? Even if it stay empty English never try to capture it, or declare a war on Celts. Perhaps Scotland could start Celtic too, and initial conquest would spill over Ireland relatively early, especially given the fact that England starts with Galleys. Current situations feels double uncomfortable considering the fact that England never had Scotland from the start, like suggested by the mod, actually England never been able to capture Scotland, while as early as in 1171 English king pronounced himself Lord of Ireland.
Sometimes I see Celtic Dublin even on 3000 BC starts as America!