I really like the “Light can communicate under L’s nose because of WoW” bit because in addition to being clever and making the convenient thing for him based on reality instead of something made up to be convenient, it lets him be a dick about more people and the symbolism of him having a max-level holy paladin because he just cheated and bought one is too good
but if he is handcuffed to ryuzaki this whole time, which he has to be to make his part of the plot have enough obstacles and interaction and make ryuzaki not seem totally toothless, then while the original plan of “phone in his lap texting while it looks like he’s raiding” works, it’s maybe no longer plausible that he can get and clone Naomi’s phone multiple times so he can swap with the phone that doesn’t have its activity logged
so option A: what I had before, he is raiding, he has Naomi’s phone in his lap, he texts his nefarious contact’s burner phone with one hand and it looks like he is concentrating on the game, and he has the same model of phone as Naomi and swaps them so he can use the untraceable one and not the logged one.
option B: he tells his nefarious contact to make a character on his server and messages him through ingame chat, because ingame chat is not monitored or recorded. he still looks like he is concentrating on the game.
option C: he tells his nefarious contact to give him the number for his burner phone, and uses a macro from some chinese gold farming service or something to translate ingame chat to and from text message
option D: all of these require too much detail and specificity that doesn’t meaningfully drive the action; come up with something else.