I feel like I'm an expert in this area... using the GFX50 for architecture. I was one of the first ones to get that camera when it first came out, and used canon tilt shift lenses with it in clumsy way. My workflow involves using the camranger and canon to shoot architecture, and was trying to get the same workflow with the fuji (wirelessly controlling it with an ipad). But there wasn't a good solution for this. There were workable solutions, bad solutions, but non good, so I sold the camer and went back to the canon/TSE lens combo, which works great.
However! camranger is coming out with a camranger that will support the 50s and 100gfx - they've told me this, and I plan to get the gfx100 and use with canon tse lenses. Can't wait!