The immigration rules are not something to get off an internet forum, we can advise on the practicals as some of us know the airport layout very well

What TIMATIC says is basically what airport staff will rely on and you MUST comply with the requirements laid down there, so you are +15 over so TIMATIC says no

If you arrive before 1600 the connection channel is T2 is open so you can pass back into the airport departures area and remain airside, yes you will go through a passport check regardless of transit destination, if you are transiting to the UK the Irish Immigration officer will actually decide if you are admissible to the UK, otherwise they confirm you have the correct paperwork for the destination on your boarding card.

When the connecting flight departs isn't actually important, its that you get through flight connections before it closes. The connecting flight can be in terminal 1 so you can do T2 to T1, but not T1 to T2 on a connection as T2 and T1 are linked airside. But that goes beyond the TIMATIC rules so you may be refused boarding at point of origin