This is my first suggestion, it's a relatively simple suggestion. We have blocks like comparators to detect and output signals, as well as a redstone repeater for delays, and lengthing. A randomizer would have 3 outputs and one input, so that players could combine various commands or use them for various survival builds. If anyone is interested and would like to talk about it. Maybe you or I can do some artwork for the design.
I know its possible to build randomizers, but in the old days we didn't even have repeaters, repeaters the old school way took up a lot of space, and while you may consider the randomizer you showed me compact, nothing is more compact than a single block. Besides with adventure mode growing, an easy way to have multiple paths to occur in a single block would be amazing