First, # of turns really doesn't mean much. Just run the pump for as long as necessary to remove the debris out of the pool and to add sufficient chlorine. Those are the only things that matter. Usually a pool can get clean in as little as 3 hours independent of flow rate and turnover. The biggest energy saver can be to simply reduce run time.

Next biggest reduction in energy consumption comes from running on low speed. Generally, that will save 50% in energy costs with doubling of run time. But sometimes you don't need to double run time so you can save even more. Water features might be an issue but why run them unless you are using the pool. The chlorinator should not be an issue although you may need to make some adjustments. The heat pump may or may not work on low speed but you can try it can't you?

A VS improves energy efficiency slightly more but usually it is not enough to justify the extra cost of the pump.

It think you should either get a toggle switch for the pump or a two speed timer. That is all you really need.