I just had a naughty thought after you mentioned the XP farm.
I think I'm going to test it in creative tonight. Going to build a typical openblocks/extrautils mob farm room with fans, spikes, and a vacuum hopper. Instead of cursed earth, put two dynamism tablets inside, both facing the same block. One will right click the spawner it's holding, the other will left click with a bedrock pick. Transfer node with a filter to pump the spawner back into the dynamism tablet.
I do something similar to process thaumcraft infused stone, except with an efficiency/fortune/corrupting essence infused pick.
The question is if a fake player breaking a spawner with a bedrock pick still summons the crowd of mobs, because if so I think that's my new favorite way to grind a given thing in massive numbers...
The real question is if there's any kind of spawner for Thaumcraft outer lands bosses that will play nice...I'm in need of some primal pearls, I keep breaking them, draining them etc and just keeping a barrel full would be much simpler than bothering with the various infusions to fix/remake/recharge them...