In a timeline where the ARW is averted by a combination of Westminster representation and more formalised local autonomy, what would happen to Ireland?
Ireland's geographic proximity means there's a stronger case for direct integration with Britain, but obviously Grattan's parliament would want the American example applied to them. Would British bribery still be able to overcome this?
Also, its not clear whether the 1798 rebellion would still happen, depending on how the chain of event affects France. However, I imagine Westminster would be continually worried about Ireland as a staging post for invasion.
Another factor is Catholic emancipation, that the Whigs were pushing for a time. I can't imagine the British being happy with Catholic control of a local parliament, so maybe union gets round this tension.