I have no time to help right now, too many other things going on.
You could look at the speeduino stuff and maybe use their hardware (arduino or teensy 3.5) to run it.
I think megasquirt may have a test mode to be able to use it as a flowbench. With the combo of those 2 this may be done.
I am interested in how you make out, if you get somewhere with it post an update here.