175mm Crank Arms on Genze?

[Sad Genze]

I have a 201, but have very long legs and find the stock 170mm cranks too short. Has anyone had success swapping in 175mm cranks for the stock 170mm? Seems to use a proprietary spider on the right crank. I have found a Shimano set with a spider that might clear the plate integrated into the bottom bracket. I am not sure how critical the proprietary spider arms holding it in place are. Anyone else with long legs who has found a solution?