The referenced shield is as close as you are going to come. There isn’t enough documentation to make a part (the site wants a login for data) and it is too much work for too little gain for me to be willing to do.
Basically this isn’t a sensible board to make (to some extent neither was the ESP board I just did, but that has more utility than this due to the usual schematic layout of ESP boards.) The mega and DUE cpu board schematics are different and won’t fit inside a part as the ESPs will. The screw terminals are a straight connection in to the cpu board (and thus a lot of work to make as a part for no particular gain.) Your best bet here is to use the Mega CPU board that exists and connect wires to the pins on the cpu board which will have the same effect as using a part that has screw terminals (but is a lot less work!)