Unfortunately, I'm in the process of moving across country. I won't have time or even my 'rig' to add such an improvement at this time.
In your copy of the script, you could create a Lua table, keyed by the avatar's UUID for those that you wish to omit from derendering. Change the line with:
to something like
The Lua table might be something like:
Changing the value to false for a UUID would allow that one to be derendered, but stay in the list, for future bypassing.
This is completely untested and just 'off the cuff', so to speak, from memory. I make no warranty or guarantee about these snippets, but they might point you in the right direction.