Sample and hold (s&h) is the basis of most random cv, but you can also use s&h to create v/oct cv sequences… it really depends what the source material is that you are sampling.
In the case of random cv, the source being sampled is usually noise (a hissing sound that surprisingly contains all of the frequencies). Because the rate of sampling is relatively slow you don’t hear all the frequencies existing at the same time, but rather just one frequency value (say low, medium or high chosen at random). This random value continues until a trigger or gate initiates another sampling of the random noise. It’s value again is random (low, medium, high frequency).
The 2hp rnd has a built-in noise source. Quantised random is s&h as explained and the smooth random is probably a linear slew limiter which instead of ‘stepped voltages’ will output a randomly varying voltage. The voltages will gradually ascend or descend towards whatever the next sampled value is instead of staying at the same value as the sample point. The 2hp rnd does not seem to allow you to choose an external source to sample.
For s&h I personally like MI Stages or MI kinks, which both have other extra goodies on board.
FWIW - I have owned the 2HP verb and I found that I didn’t like it unless I put a delay in front of it. I found the predelay on the verb quite obtrusive.
You seem to have a healthy dose of constraint. Your setup has quite alot of flexibility. Seems like a good idea to explore the potential at your fingertips first before expanding.