Most classes only use a few commands/skills so it should be easy to create an app to present those as buttons.

So essentially you need like 6-7 buttons for skills/spells and something to select targets from those present in the room.

Generic emotes are also straightforward.

Yes, customized emotes and speaking is harder (although typing on an pad is not that much slower) so it should be a clAss that does not talk much. Either because of lore (some dumb giants) or because of mechanics (like shifters).

Once somebody played the simple ipad class he would want to try others and get hooked...

With a nicely designed app the number of players could easily get into the hundreds again.