Apothic Spawnners allows you to change spavner objects. Prior to acceleration, prepare a closed camera, a way to remove the mobs from the spavnar area and accessible control. If the creatures stay close, reducing the delay will not produce the expected result.
Maud also allows spavners to be picked up from Silk Touch. Before moving a rare block, check the requirements of your modpack: the prescriptions of the modifications and their limits are adjusted.