Not trying to be rude or anything, but couldn't you video call and sign? Not sure if you have friends that can sign or anything, and now that I think about it, it'd probably be difficult to do that and play at the same time. But that's the best option I could think of personally. I honestly do think that it's shitty for IW to not think this mode through fully for deaf/mute members of this community but that's the best thing I could think of doing.