Dodge action, disengage, and ready action should really be in the game. Without them the combat feels a lot more shallow compared to the tabletop.
I like that idea for "ready action", the Divinity game had the option to drop down in queue (although I think you stayed in that position after you did it once).
My idea for "ready action" was for a proximity attack feature. You may of seen a similar mechanic in other strategy games. Essentially this is the "hold your ground and attack something that crosses this area" command. When I play pnp, this is generally the most common usage of the ready action.
However I do like your idea a bit better as it would be more flexible, kinda like the pnp feature is. One thing to keep in mind is in the pnp, when you ready an action, you are essentially also giving up your reaction. This is technically how it works: on your turn you ready an action and set a trigger for it. When the conditions for the trigger are met on someone elses turn, you use your reaction to execute the readied action.
To translate your idea to this game, it would essentially mean you "Ready your action for the moment character x does something" and you would position yourself in the queue right before character x, as if you were watching them and reacting the second they move. Essentially movement must be done on your turn, your bonus action can only be used on your turn and your reaction is spent in the process as well.
in either case, a "use this action at first target that enters range" or a "use this action as a reaction to target taking its turn". I would love to see more actual commands from the pnp game as the "1 action per round" economy really relies on having a variety of appropriate choices
