Replacing COTS gear stages with chain or belt

Did you know you can use HTD pulleys instead of gears in the VexProSingle Reduction Clamping Gearbox, or in the 3rd stage of a Ball Shifter?

Here’s a spreadsheet of belt/pulley and chain/sprocket combinations that may be swapped into some common COTS 20DP gear spacings: 84, 90, and 112 teeth.