OK, this sounds a bit ridiculous, but that's one of the points. You can only use non-ASB ways to achieve these scenarios.
Essentially, try to create :
1.) The most plausibly dystopian Troubles possible, with Northern Ireland essentially devolving into a complete war zone, with most people of either side acting like extremely paranoid gun-toting revanchists (on the level of Haiti or the DRC at its lowest historical moments).
2.) The most plausible "utopian" fate for Northern Ireland, where most of the biggest social and economic tensions are effectively fixed soon enough to prevent anything on the scale of OTL Troubles.
The POD for both scenarios can be no earlier than the 1910s.
Essentially, try to create :
1.) The most plausibly dystopian Troubles possible, with Northern Ireland essentially devolving into a complete war zone, with most people of either side acting like extremely paranoid gun-toting revanchists (on the level of Haiti or the DRC at its lowest historical moments).
2.) The most plausible "utopian" fate for Northern Ireland, where most of the biggest social and economic tensions are effectively fixed soon enough to prevent anything on the scale of OTL Troubles.
The POD for both scenarios can be no earlier than the 1910s.