WI: Catholic Emancipation in 1800

William Pitt the Younger had promised that Catholic Emancipation would accompany the Act of Union of 1800, which is to say that various restrictions on Roman Catholics would be abolished alongside the Act of Union. However due in large part to George III's opposition to any form of relaxation of restrictions on Catholics, Peel was unable to bring in Catholic Emancipation and resigned.

Now suppose Peel was able to persuade, force or cajole the King into agreeing to Catholic Emancipation (as the Duke of Wellington did IOTL to George IV, who supposedly wept as he gave his assent to the Act). What would the effects of this be? How would Catholic Emancipation twenty nine years early effect the development of Irish Nationalism? How would other events be changed by Pitt not resigning over the issue?
 
The Union plan was initially highly popular with Irish Catholics for this reason, both due to the practical importance of getting the vote, and also for what it represented: that the British were protecting them from the abuses of the Protestant Ascendancy. When George III stopped emancipation, it made the Irish Catholics instead think that the British would actually side with their fellow Protestants anyway.

If emancipation went through, I can imagine the Irish being very pro-union for about a decade or two, before beginning to get frustrated with the pace of reform and the continued discrimination they would still face. Still, it would delay Irish nationalism forming significantly, and, if it formed after emancipation, it would likely look more to democratic means for their goals rather than violence. There is definitely a much higher chance for Ireland staying permanently in the Union, but it would be no means certain. Westminster would have more breathing space to drag their feet on things like home rule, but it still wouldn't be indefinite.

There are other effects too: with a boat load of reform-minded Irish Catholics in parliament, other reforms are likely to be brought forward. I can't imagine they could hold back the Great Reform Act to the 1830s in this timeline.
 
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