You cant make Ender Lilies grow faster(other than planting them on End stone), since they are bound to day cycles. Planting them on Endstone reduces the amount of day cycles needed to mature. If it will actually detect the day cycle is a bit other story. You can by using some stuff that increases the number of block updates make sure that it always detect the day cycle and grow one step during it.
If you however expose it to anything that mimics the bonemeal effect, it will regress the plant backwards.
On that note I am actually pretty sure the Lilypads are in the first category, as they increase the number of block updates. So guess they wont harm the Ender Lilies.