The entirely self-serving suggestions continue.
Proposal: Add Stone Bones as an available spell to bards at innate level 2
Whilst it may be a bit strong at circle 1 and I could anticipate people taking it for the bludgeoning resist alone, Bard spell selection is very limited and at a premium in respect of circle 2 spells so I don't anticipate this being taken as an option by anyone other than a dedicated necro-bard. It's a nice quality of life option for them to further enhance their undead.