alternatehistory.com

A somewhat unrealistic list based on the prospect of a successful powersharing period. Trimble remains in the anti-Assembly portion of Vanguard which ends up merging with the DUP, which is why he's there after Paisley. Biggest change here (aside from all the other ones) is the non-existence (well, de facto) of Provisional Sinn Féin, which does slightly better than IOTL's Workers Party.

1973-1976: Brian Faulkner (Pro Assembly UUP-SDLP-Alliance-Pro Assembly Vanguard coalition)
1976-1976: Gerry Fitt (Pro Assembly UUP-SDLP-Alliance-Pro Assembly Vanguard coalition)
1976-1977: Brian Faulkner (Pro Assembly UUP-SDLP-Alliance-Pro Assembly Vanguard coalition)
1977-1978: Merlyn Rees (NI Secretary - Direct Rule)
1978-1984: James Kilfedder (UUP-SDLP coalition)
1984-1984: John Taylor (UUP-SDLP coalition)
1984-1986: James Kilfedder (UUP-SDLP coalition)
1978 Def: Gerry Fitt (SDLP), Ian Paisley (DUP), Oliver Napier (Alliance), Bernadette Devlin (Irish Republican Socialist), Robert Bradford (United Vanguard), William Craig (Independent Vanguard), Eddie McAteer (Nationalist)
1982 Def: Gerry Fitt (SDLP), Ian Paisley (DUP-Vanguard), Oliver Napier (Alliance), Bernadette Devlin (Irish Republican Socialist), Cathal Goulding (Official Sinn Féin)
1986-1988: John Nott (NI Secretary - Direct Rule)
1986 'Def': James Kilfedder (UUP), Gerry Fitt (SDLP), Ian Paisley (DUP), Bernadette Devlin (Irish Republican Socialist-Official Sinn Féin), Oliver Napier (Alliance), Thomas McMahon (Republican Sinn Féin), Jenny Jones (PEOPLE)
1988-1989: John Moore (NI Secretary - Direct Rule)
1989-1990: Gordon Brown (NI Secretary - Direct Rule)
1990-1992: Paddy Ashdown (NI Secretary - Direct Rule)
1992-1994: Austin Ardill (UUP-United Irish Peoples Front coalition)
1992 def: Dáithí Ó Conaill (United Irish Peoples Front), Jim Allister (DUP), Eddie McGrady (SDLP), Eillen Bell (Alliance), Jenny Jones (PEOPLE), Thomas McMahon (Irish Democratic and Republican Party)
1994-1996: Harold McCusker (UUP-UIPF coalition)
1996-: David Trimble (DUP-PEOPLE coalition)
1996 def: Jenny Jones (PEOPLE), Harold McCusker (UUP), Eddie McGrady (SDLP), Dáithí Ó Conaill (UIPF), Brian Wilson (Alliance), Francie Brolly (IDRP)