My Acorn system allows several G28 / G30 "return" positions to be stored, for things like tool change, tool setter, park etc. But G28 seems to be quite a confusing command and is interpreted and implemented differently depending where you look. I don't recall a similar table of return positions in the Newker controller.

There's the option to set coordinates for the electronic tool setter in mine. As I have bolted mine to the table, I use that option. The alternative is to simply sit it on the table under the tool. The advantage of that approach is that you can also use the tool setter to acquire the top of the stock, by sitting the setter on top of the stock, touching off, then automatically subtracting the height of the setter from the Z coordinate.

There is an MPG input on mine which I use with a wired MPG but I looked into using the original DRO linear encoder inputs to display actual position rather than commanded position. Thought that sounded like a nice idea - I'd come to believe this was possible but turns out it isn't. I could still use an index pulse output from the motor servo drive (if it was available) to improve the homing accuracy but on my Bridgeport that would be lipstick on a pig.

If you want to use the handwheels and see where the machine is, I think you'd need to have the "absolute" version of the controller which communicates with the servos through some sort of serial bus. Even then it's not clear if that mode is supported.