FWIW there isn't any kind of contract your lawyer could draw up between you and the machine OEM to preclude them delivery a machine to you without the safety devices, no matter how much you promise to "Not sue in case of injury".
At both DMG MORI and Mazak we had customers take delivery of new machines with the logic modified so that they could have the spindle on with the door open.
You have to really want it though. I recall the approval process being long and arduous. The last one I remember specifically their justification was to have the ability to dress grinding tools in the spindle by hand.