I really like you tony and your casting bro, but I voted no. A tournament should always guarantee the best possible situations for the players. This means as lag-free and cheat-free as possible.
When you would live cast the games, you would introduce lag into the game (as any other obs) and even if you would use a 5 minute delay, people could still see what the general strategy of the opponent could be.
So I am against any obs including casters in a tournament game. BUT I would suggest a rule that prohibits players to talk about the results (other than reporting the result to Sword) and sending the replays asap to the caster. Best solution would be, if you casted the replays just as players finished it. Like players play a game, finish it and give you immediately the replay (before starting the next one) and you cast that replay. That way would be the best compromise imho.
Also live casting can be difficult too, things like disconnects or long pauses inside the game happen, which can be uncomfortable to deal with as a caster.
Anyway I hope to see a cast of yours for this, whether live or not, it will be a pleasure bro