There is a good chance they will. Both Hedera and Schefflera belong to the same subfamily,same for Fatsia and x Fatshedera. I don't have these plants, so will not test it.
To this way, Schefflera sp. is also a part of Araliaceae.
Maybe you could try it also, if they will accept?
from L1, not so strange, preferred wild host plant is Cussonia, related to Hedera.
Very interesting, that they are feeding on Hedera.
Since L1 or later?