After a big fight, I am FREE of the DC-LT pump. I managed to get my EK-XTOP SPC-60 PWM into the case beside the 1080 Ti FTW3. This is a bigger card than almost any other card, so I expect others won't have this problem.
I accomplished this by disassembling the pump and removing the "feet" that are also the bolts that hold the pump to the pump top. I drilled holes in the front of the case, then had the difficult fight of lining them up and mounting it with the top radiator/fans in place (because the top radiator looked like it would be impossible to slide in with the pump in place.)
HOWEVER this means I have to literally disassemble the pump and fight with bolting it back in if I want to remove ANY components from the GPU side of the system. I also have to figure out where to put my fill and drain ports, but I think I can figure it out. I won't proceed any further until my pslate cables arrive. I ordered an unsleeved kit to be physically smaller and to match the UV+Plexi theme I'm going for in this case. Now that all the big parts are installed, I am VERY excited to keep going and more confident than ever that I can get it done. I expect my reservoir will be just a length of tube that I can tuck away, and will also serve as my drain/fill port.