Actually, the first part is optional, in most of the cases, you could work it out without it.
Even with all the obfuscation here, IIRC, map event conditions are still standard, so as long as you can find recollection map and check those, you should be in the clear.
Pray tell how you are going to activate the ruby scripts that unlock the scenes without the aid of the editor, as those are not just switch / variable based events in this particular game, and the unlock conditions are within the ruby scripts? I am most curious

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As for side note, here is the Hアニメ回想 (recollection / gallery map) on the editor, as you can see, it contains no events whatsoever, nothing to change or alter with,
all in game events are script called through ruby scripts commands, example; <on1_rpg_npc_load("E012")>.
There is a separate ruby script that places all the 'buttons' on this map and handles their function, and another for checking if the event unlock conditions have been met, whoever wrote this game's scripts knew what they were doing with ruby, and whoever translating this game is going to lose hair or two while at it

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You need to search through a lot event scripts to find out the gallery event unlock script calls if you want to make an event that unlocks the gallery scenes, I don't see how you can pull that off without having the editor

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And for final addition to this post, I am making translation to the UI; items, skills, armors, weapons, menu, settings and parameters, etc. (there are some words that's english counterpart I do not know, so it will stay in moonspeak until that aspect changes.)
I will upload the translation files later tonight, so if you want the UI in english, do approach me in PM's.
It will be on game version 1.11, sneak peak below.
If you want to give me a hand on it, please do PM me about it.