Spark 3 valve control options

I would like to start to using my Spark 3 to its great potential.

I have a large collection of 5-wire valves.
I have Slave interfaces for Modbus RTU that can add control and report valve postion. But I think the RS485 interface was not activated. So these may be scrap now.

With the withdrawal of the valve control board, what options remain for the control of valves with the Spark 3?

This is something @Elco will have to answer, as my knowledge is far from complete.