So can bearded dragons eat spider plants at all?

They can eat spider plant leaves. Just be aware that the sap is a known irritant to bearded dragons.

Image “Hierbabuena 0611 Revised” by Hierbabuena_0611.JPG: Dtarazonaderivative work: Peter coxhead (talk) – Hierbabuena_0611.JPG. Licensed under Public Domain via Commons