A good initiative trick is to have a card with each player's name on it, and a card for each enemy (or group of similar enemies).
Once you roll initiative, shuffle them into order. Now, actual rolled initiative no longer really matters. Someone who is delaying their action or reading an action gets turned up on edge (like they were a tapped Magic: The Gathering card, if that makes sense to you).
That way, you can tell the player when they've been delaying for a full round or have been readied for a full round.