Remove Actors from leveled lists

[BeowulfMKII]

Is there any way to remove actors from a leveled list?

 

I know that papyrus only has functions to add or revert changes made by scripts, but is there any function in SKSE or Papyrus Util that does the above?

If the answer is no, then consider the following:
Dozens or even hundreds of copies of a leveled list get added to another leveled list
will this affect game performance (since the engine will have to choose one randomly from all of those actors every time it spawns a actor that pulls from that particular leveled list)?