You can attach a USB keyboard to PS or your Xbox console for typing. Works in D2 for chats only. There are YT videos on how to communicate using typing for this mission (hate to say this but even Kackis has one video for this!) The timer extends as you progress so that is not a big blocker. Timer anxiety had always been a part of endgame content for different mechanics. Jump here before the platform disappears etc, so I don't think that is new. Back in original whisper mission, I was bad at jumping and wouldn't even reach the first encounter by the time running out. Last season, I managed to finish legend whisper 1st time with 3 seconds remaining. 2nd finish was with almost 3 minutes remaining. It is about trial and learning and if a crap player like me can do it, anyone can!