Sorry, I was using the launcher from Ansem's build (https://ansem-xae.github.io/dspico.html) earlier, and that combo belongs to that build.
That is indeed the combo, intended to return from the game to the launcher.
Thanks for the fantastic work!
Would it be possible, in a future build, to include an option to change the soft reset shortcut? On the original 3DS, the R + L + Start + Select + D-pad Down shortcut is impractical.