PTH / NPTH larger than 5.6mm

Hi there,
I’m currently working on a new design which requires M8 holes for connecting the PCB to power electronics. So the drill diameter of the hole needs to be 8.5mm. Unfortunatley the biggest hole size supported by Aisler is 5.6mm. How can I change the PCB that it can be manufactured? Through Milling a round circle? The M8 hole doesn’t even needs to be a PTH, I only need copper on the Top and Bottom as contact area.