If you want to do that in editor (not in game) then it should be possible, using the Merge Actors tool by hand, after spawning. Still, each preset will introduce some lag when spawning, so it all depends on the amount of assets to spawn and their complexity.
But check if your solution works with in-editor spawning. E.g. it’s possible to use Spawn Actor From Class in editor from button click (Blutility), but not in Construction Script.