Disclaimer: I don't work for FFG, and I have very strong doubts that they will ever publish a product like this, or reprint previous products with different distributions. But I've seen this idea mentioned several times, and I'm curious how much people would be willing to pay for such a product, since ultimately, if the price is high enough, it seems likely that FFG might consider it.
A "Completist Companion" would be x2 copies of all of the cards from a Chapter Pack cycle that originally had a x1 distribution. For example, a "Time of Ravens" Completist Companion would contain the 2 copies each of the following cards:
Kings of Summer
Dragon Sight
Jeyne Westerling
Priestess of the Pyre
Selyse Baratheon
Red Warlock
Maester of the Sun
Lion's Gate
Open Market
A Song of Summer
Kings of Winter
War Horn
Maester Vyman
Janos Slynt
Valyrian Spirit
Obara Sand
Mance Rayder
Ser Arthur Dayne
The Wall
The Winds of Winter
The Long Winter
The Long Summer
Demon's Dance
Shadow Stalker
Theon Greyjoy
Maester Aemon
Walder Frey
Den of the Wolf
A Time for Ravens
Unconventional Warfare
Dawn
Grand Maester Pycelle
Renly Baratheon
Kraznys mo Nakloz
Samwell Tarly
Vale Rookery
Heart of the Kingdom
The Tower of Joy
Desolate Passage
The Raven's Song
Needle
Cat o' the Canals
Arena Knight
Alannys Greyjoy
Bandit of Winter
River Bandit
Bandit of Summer
Gilly
War of Five Kings
The Tides of War
Northern Cavalry Flank
Northern Infantry
Tommen Baratheon
Pirates of Orkmont
Retreat and Regroup
Missing Recruit
Spy in Their Midst
Beguiled Bodyguard
Winter Reserves
Summer Reserves
That's 60 different cards, so x2 would be 120 cards. This immediately draws to mind the "Princes of the Sun" expansion, which was 120 cards (x2 copies of 60 cards), and was priced at $25 retail. But I don't think FFG would realistically publish it at that price point, since it would have a much smaller market than Princes of the Sun (the market for a "completist companion" would be everyone who has bought those chapter packs, but hasn't bought them in multiples).
For each "Completist Companion," I would pay $30 retail (the same as a big box expansion). I've bought multiple copies of the Core Set, Kings of the Sea, and the Princes of the Sun, but I won't buy multiple copies of the Chapter packs because each additional pack would represent 50% waste. But I would by a "completist companion" for each of the four x1/x3 distribution cycles (Clash of Arms, Time of Ravens, King's Landing, and Defenders of the North) for $30, and be quite happy.
What would you pay for a "Cycle Completist Companion"?