Sorry for the slow response. My boss modified the case during Christmas vacation. I haven't seen the work myself, but he said he cut a u-shaped slit in the case near the SSD. He then bent that section out & then flat again so that it would be parallel to the rest of the case but slightly further out. He said he plans to tack weld it into place later & seal with JB Weld, but is just closing it with tape for now. I haven't seen the results myself, but he seems to be happy with it. The bent piece still sits close enough that it doesn't touch when the laptop is on a table, but apparently the clearance is minimal. In his words, had he known this would be the solution from the beginning, he would have settled for the OEM 256GB SSD, but having already purchased the drive & adapter, he is happy with the result.
It appears to be a Phillips or similar. I think I just used a driver from a watch repair kit. It wasn't installed tightly enough for me to worry too much about stripping it out.