Farming Evil bones

Not really, unfortunately. As tedious as they are, farming Fuyuki nodes is the best you can really do. The upcoming event doesn't seem to offer any bones.

The half AP Saber/Archer/Lancer Novice quests the past few days are actually a little better than Fuyuki - and they give other stuff.

I've farmed 30 bones for my new Tamamo and the 3* EXP cards got Musashi from level 67 to 72.