Yeah that's the problemRetroarch is giving me an error that starts with, "ISI: Bad execute of unmapped memory at 00000000."
Also, the last part of title redirection doesn't seems to work for me, might be because I'm using MochaCFW.
Since RetroArch needs the extra memory given by main titles, you won't be able to use it with anything else other than Atmosphere or a variant of it.
RA depends on that extra memory for many cores to run well, since many of those cores have dynarec and they depend on it for optimal performance (Like Mupen64 and melonDS)