Revolutionary Todyo
Banned
The Irish idea seems to be along pretty believable lines.
If the whole of Ireland wants to be independent then much of the Irish debate is nullified and it is far more likely that Ireland will break away from the UK in an entirely peaceful and orderly fashion.
IOTL it was the north insisting they remain part of the UK and sympathisers in the UK that were the route of much of the delay that led to the republicans getting stupid.
IMO if you have the whole of Ireland voting for home rule then you'll probally manage to get it in the 19th century.
That it would then have this other stuff happening....well, I have to say there that you can't ignore Britain. Even a 100% independent republic of Ireland is going to be strongly affected by the slightest of moves made by Britain. If the Irish government is under threat in a scenario where its relations with Britain are good then you'll probally get British help to stop things getting out of control.
Basically for a fascist/communist/whatever Ireland you probally need the same thing in Britain.
Well whilst the Fascist regime did come about due to the threat of violence Pearse and his paramilitaries, most of the British government view it the same way they've viewed Mussolini, a highly effective force for good in an unstable country, and as Pearse regime is still friendly with Britain and staying in the Commonwealth there's not much cause for argument.
As for the other scenarios, unrest in the North, agrarian violence etc. Firstly, I say that Britain would rather avoid getting stuck in Ireland again, they haven't had as many bad experiences as OTL but they don't want to exacerbate a situation by sending in the troops.
Secondly the Home Rule governments have tried to keep their problems hidden from Britain as much as possible, showing that they can run the country effectively is a big thing for them.
Thirdly, Britain has offered assistance in mediating between the government and more militant Unions, and have offered to send advisors to help the army. These have been rejected by the Dublin governments for the second reason.
And lastly, things haven't gotten so bad that Britain feels that they have an obligation to intervene. The insurrection in Ulster was as small as the Republican faction in the Civil War, and with their level of public support. It never had the manpower or equipment to prove a serious threat to the state, using more hit-and-run and terror tactics then an actual guerilla campaign.
The unrest in western Ireland is larger, with some international support from left-wing governments abroad, but it's also far more remote so it's less heard of in London.
I hope that helps somewhat, Pearses coup is seen as a necessary evil by many, and he has the support of many Conservatives, but it was not seen as the pinnacle of any chaos which requires British intervention. And to be honest, it was Pearses which kicked off most of the things. Not to say things won't get worse, just that they aren't that bad yet.