You can just download the movies and any other files you need from the game using Maxthon Cloud Browser built-in Resource Sniffer, or any other browser's Developer's Console using the tutorial from our Wiki, you know...
The way you suggest looks too complicated for me.
All the movies from all events, including those that took place at the times that i wasn't even playing PPS yet still are available to me at this moment (just checked to ensure that).
(The first Elite Guard Event i participated in was EG3 Event, with EG 327 Ayaka Mizutani, and i believe i's started playing PPS little time before it's beginning)

You'll never get a complete "movie" file for any scene in PPS - they consist of a "container" .swf file, and separate backgrounds, sex animations, separate mp3 voice files for each girl's line, text file, scripts and a bunch of other files played inside that "container.swf" via some script... (i'm not a specialist in coding, so i have no idea how all that crap works, but i'fe already tried ripping resources from PPS and that was the best i've managed to get, when i tried to get myself those sex scenes to play offline, since they take forever to pre-cahce every time when i try to play them, so i just can't fap to several movies consequentially during one "fap session". I also tried ripping the SEG fights music, and it took me 2 SEG events to manage to finally do that and get what i want, because previously the best i got was a bunch of SWF containers that do nothing if i try to pley them in the Standalone Flash Player)