What if This Way! (preferably changed to "Over Here!") and Booyah! (preferably changed to something more normal for Gen Z) stayed as the top and bottom buttons, but the side two would vary by mode? Maybe Turf War could have Watch Out! and Help Me Out! (different from This Way, since This Way usually indicates something good is that way, such as a Power Clam or the Rainmaker), Splatzones could have the same as Turf War, Rainmaker could have Defend Me! and Let Them Take it..., Tower Control could have Wrong Way! and Hop On!, and Clam Blitz could have Pass Me Clams! and Defend the Basket!
Another thing Nintendo could do is give us a mic and do some sort of speech to text thing where what we say appears in a chat box. Offensive and inappropriate words will be censored and saying such things could gives you strikes (three strikes and you loose online for five minutes) Thought that might work to sort of give us VC, but not exactly.