Because this task is such a grind/pain in the @$$, I figured I would toss this up for anyone that was curious, but couldn't be bothered to do it themselves.
As a side note, paying back the money triggers Substory 52, which is needed to unlock Substory 79 to challenge Amon to a fight (Complete Substories 1 - 78) for the "Go Back to Kamurocho!" trophy, which in turn is required to unlock the "The Savior" trophy. (Complete all Substroies)
Also, for anyone that is wondering, I farmed all of that IDL from the final 2 missions in the Manager Kenshiro minigame at the Night Club.
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*Fist of the North Star: Lost Paradise was developed by "Ryu Ga Gotoku Studios" and published by "Sega". I do not own any content pertaining to their Intellectual Property.*
Fist of the North Star: Lost Paradise Statistics For Zertonium
At present, Zertonium has 12,595 views spread across 4 videos for Fist of the North Star: Lost Paradise, with his channel publishing less than an hour of Fist of the North Star: Lost Paradise content. This is less than 0.97% of the total video content that Zertonium has uploaded to YouTube.