Don't you simply look for abstraction instead of sub-patch?

Based on your previous patch:

It maybe can work in message space if we start with a [bang~] to trigger the computation until it fill a 64b array and then play.

EDIT : Yes it does

Without [expr] it should like this

You can even use a single [tabread4~] to play the array twice throw the multichannel support.
Patch from the [tabread4~] help with a small modification:

Another possible algorithm:

1. Fill a list with the samples, randomize it
2. Drop the samples one by one, use it and fill another list
3. When the first list is empty, switch with the second, randomize it and goto 2.

If you pick a random sample of the second list before the last of the first is consumed then you prevent repetition.

Hi,
You don't need the parent name if you use [iemguts/sendcanvas]. For an example see
https://forum.pdpatchrepo.info/topic/15118/tooltip-display-a-message-about-an-abstraction-in-its-parent

The gui ping when you change the array values by mouse:

FYI it opens with PlugData.

@willblackhurst you generate the combinations but the main subject is the permutations I think.

EDIT: my two cents

perm4.pd

FYI I've played with dynamic display here https://forum.pdpatchrepo.info/topic/15118/tooltip-display-a-message-about-an-abstraction-in-its-parent/1