As you may know, Input Redirection can be used via HBL (https://github.com/Stary2001/InputRedirection/releases ). Since with hax 2.8 wil support Extended Ram Games ( Like Sun & Moon; https://twitter.com/smealum/status/806741494237315077 ), would it be possible to use this program at a O3DS for S/M or even with this, it wouldn't be possible?
No, because it can't read or write RAM.