Frankenstein's monster! I like it. I always refer to them as the blood-sucking plant abominations.
If you could save the Hylo, they are actually pretty plants. I have seen a few that the "heads" have fallen off and the Hylo grows arms and survives the adventure. The usual Gymno graft recipient is Hylocereus undatus (Dragon fruit).
I don't know if reducing the size of the Gymno will save the Hylo.
Daisy