Good post.
I would also point out that most of the 1798 leadership were Protestants, particularly Dissenters (Presbyterians especially). All attendees at the first and founding meeting of the United Irishmen in Belfast in 1791 were Protestant. Only two, Wolfe Tone and Thomas Russell were Anglican, the rest were Presbyterian - Sinclair, Henry Joy McCracken, Neilson, Haslett, McIlveen, Simms, McCabe, Tennant, Mc Tier and Pearce.
Lord Edward Fitzgerald was a prominent leader of the Rebellion in Dublin, as were Holt in Wicklow, Harvey and Perry in Wexford, Crosbie in Carlow, and Aylmer in Kildare.
In !801 Robert Emmet led another short-lived rebellion; the Young Irelanders in the 1840s were led by Davis and Mitchel, and Smith-O'Brien led the Fenian Rebellion of 1848.
As a very good nonogenarian Baptist friend of ours from East Belfast remarked to me when I gave her some books on this; "So, the first Fenians were
Prods !! "
Shaw and Parnell led the movement for Home Rule towards the end of the 19th century, and all of the following were Nationalist MPs:
Sir John Gray, Stephen Gwynn, Henry Harrison, Jeremiah Jordan, William McDonald, JG Swift MacNeill, James Maguire, Pearce Charles de Lacy O Mahony, Isaac Nelson, John Pinkerton, Horace Plunkett and Samuel Young.
In the 1916 Rising, Bulmer Hobson, Countess Markiewicz, Erskine Childers, Roger Casement, Thomas Myles, Robert Barton were prominent Republican leaders.
Sam Maguire, after whom the All Ireland Football trophy is named, inducted Michael Collins into the IRB.
I have many very close friends and neighbours in Kilkenny who are Protestant but regard themselves as very much part of the Republic of Ireland.
The Orange Order which was founded in Dublin in 1801 has only one lodge left covering Dublin and Wicklow, with a handful of members. The only southern counties where there are reasonable numbers of active lodges are in Donegal, Leitrim, Cavan and Monaghan. I don't know for certain, but I suspect that their membership are happy to maintain their Orange traditions while remaining citizens of the ROI, even though they are very close to the border.