I’ve reworked my setup slightly:
Instead of attaching the camera to the copy stand, I now use a lens clamp instead. This lets me rotate the camera so that I can see and use it as usual, which is a great relief.
Gear: Stand from Fujimoto “Lucky” enlarger, Canon EOS 5D3, Canon EF100 f/2,8 USM, Kaiser plano backlight, cardboard lens shade, rocket blower and remote release.