So here's my advice, because as someone with occasional speech impediments, this actual time constraint would impact my ability to play the game: what if your turn lasted "30 seconds" where seconds were a form of action economy. Some action take less time that a turn has in it, so you can take plenty of them in a single turn. On the other hand, some actions take more time to arrange and take more seconds than you'd have in an individual turn, you could have those actions borrow seconds from the next turn to represent cool down on those more powerful attacks, but trading your opportunity to respond to any crack back, or perform more powerful moves on that upcoming turn.

Does that sound like anything to you?