I've been thinking about this for a long time. I would love nothing more than to see this series come to light. I also created two bookend omnibus' around this series. Starting immediately after "The Exile and Other Stories" omnibus.
Superman: The Engagement and Other Stories Omnibus (1989-1990)
Action Comics #647-660
Superman #38-50
Adventures of Superman #461-473, Annual #2
Starman #28
Then the series as such:
Superman: The Triangle Years Vol. 1 Omnibus (1991)
Superman #51-62, Annual #3
Adventures of Superman #474-485, Annual #3
Action Comics #661-672, Annual #3
Man of Steel #1-6
Superman: For Earth
Superman: The Triangle Years Vol. 2 Omnibus (1992)
Man of Steel #7-16, #17 (minus epilogue), Annual #1
Superman #63-72, # 73 (minus epilogue), Annual #4
Adventures of Superman #486-495, #496 (minus epilogue), Annual #4
Action Comics #673-682, #683 (minus epilogue), Annual #4
Superman Special #1
Superman: The Triangle Years Vol. 3 Omnibus (1992-1993)
Man of Steel #17 (epilogue only), 18-27, Annual #2
Superman #73 (epilogue only), 74-83, Annual #5
Adventures of Superman #495 (epilogue only), 496-506, Annual #5
Action Comics #684 (epilogue only), 685-693, Annual #5
Justice League America #69-70
Green Lantern #46
Legacy of Superman #1
Supergirl and Team Luthor #1
Newstime Magazine
Superman: The Triangle Years Vol. 4 Omnibus (1993-1994)
Man of Steel #0, 28-37, Annual #3
Superman #0, 84-93, Annual #6
Adventures of Superman #0, 507-516, Annual #6
Action Comics #0, 694-703, Annual #6
Supergirl (mini-series) #1-4
Superman/Doomsday: Hunter/Prey #1-3
Superman: The Triangle Years Vol. 5 Omnibus (1994-1995)
Man of Steel #38-49, Annual #4
Superman #94-105, Annual #7
Adventures of Superman #517-528, Annual #7
Action Comics #704-714, Annual #7
Man of Tomorrow #1
Doomsday Annual #1
Guy Gardner: Warrior #30
Superman: The Triangle Years Vol. 6 Omnibus (1995-1996)
Man of Tomorrow #2-6
Action Comics #715-726, Annual #8
Man of Steel #50-61, Annual #5
Superman #106-116, Annual #8
Adventures of Superman #529-539, Annual #8
Steel #22
Superman/Toyman #1
Superman: The Triangle Years Vol. 7 Omnibus (1996-1997)
Superman #117-127, Annual #9
Adventures of Superman #540-550, Annual #9
Action Comics #727-737, Annual #9
Man of Steel #62-71, Annual #6
Man of Tomorrow #7-8
Superman: The Wedding Album #1
Superman: The Triangle Years Vol. 8 Omnibus (1997-1998)
Man of Tomorrow #9-10
Man of Steel #72-79
Superman #128-135
Adventures of Superman #551-557
Action Comics #738-744
Superman Red/Superman Blue #1
Superman Secret Files #1
Aquaman #43
Challengers of the Unknown #15
Teen Titans #19
Supergirl #20
Steel #50
Team Superman Secret Files #1
Superman Forever #1 (minus epilogues)
Superman: The Triangle Years Vol. 9 Omnibus (1998-1999)
Superman Forever #1 (epilogues only)
Adventures of Superman #558-563, 1,000,000
Action Comics #745-750, 1,000,000
Man of Steel #80-85, 1,000,000
Superman #136-140, 1,000,000, Annual #10
Man of Tomorrow #11, 1,000,000
Superman: Save the Planet #1
Superman: The Doomsday Wars #1-3
Superman: The Triangle Years Vol. 10 Omnibus (1999)
Man of Tomorrow #12-15
Superman #141-150, Annual #11
Adventures of Superman #564-572
Action Comics #751-759
Man of Steel #86-94
Supermen of America #1
Superman Secret Files #2
Superman: King of the World #1
Team Superman Secret Files #1
Then to cap it all off, I'd like to see:
Superman: The New Millennium Omnibus (1999-2000)
Superman #151-163, Annual #12
Adventures of Superman #573-585
Man of Steel #95-107
Action Comics #760-772
Superman: Y2K #1
Superman: Emperor Joker #1
Superman: Metropolis Secret Files #1
Obviously some volumes would be a better experience than others based on the quality of stories, but I believe this is a series that DC should definitely be considering. Fingers crossed!