Took me awhile to get back to it sorry. I ended up using AutoWiz's suggestion to add some breakout boards to duplicate the inputs into 3 extra stepper drivers and it works great! Not sure if there is a way to mark a thread as solved or closed but I certainly got the answers I needed.

Ill start a separate thread for this but In case anyone has an easy answer Ill add it here too. My current project issue is that I intend to use manual zeroing for all axis but my bed lowers a few mm before a print starts. It lowers twice at different speeds then once more after the hotend has reached temperature. Cant find a relevant setting in Marlin firmware.