…and seems to work on PPSSPP RA core 
I might be slightly late to the party but for anyone who doesn’t already know and cares, if you Google the above phrase, it should bring up a reddit post with instructions on how to do this via the game’s page on the speedrun.com site.
I’ve refrained from posting direct links as there’s a (patched) ROM involved and I didn’t want to get my wrist slapped!