Thanks for sharing your heretical method for growing nepenthes. I think you are justified to fear that your heinous departure from official nepenthes doctrine will land you in the middle of a weenie roast (literally), but I think I will hold onto my own firewood in this case because it has been my experience that, if given the opportunity to send their roots into water, (at least some) nepenthes will choose to do so, and this presents tantalizing possibilities for alternate methods of culture.
I began to notice this tendency in the plants some years ago. In my lowland setup, the plants have always been suspended over water, with the bottoms of the pots about 4 or 5 inches above the water's surface. One day I noticed roots coming out of the bottoms of the pots. I wanted to see what would happen, and so I allowed them to develop until they reached the water. There they spread out quickly into dense mats with hundreds of small black roots reaching up over the water's surface like tiny cypress knees in a swamp, and the main roots coming down out of the pots developed into thick woody ropes. The plants themselves seemed to be very healthy, and because of that I saw no reason to try to "fix" the situation just because it was unconventional. I did eventually have to deal with it when I got some more plants and had to do some rearranging.
Later the same thing began to happen with other plants in my smaller tanks. The roots would get into the water underneath, and it presented a challenge when I needed to take them out for repotting or for a trade. I have a N. muluensis x lowii that has been growing like that for years now (I'm afraid to look), and I just leave it because it seems to be happy. It's a small-growing hybrid, so there is no reason ever to consider taking it out of there. I just trim it up sometimes if a stem gets lanky.
Whatever works . . .
swords: I find that my N. rafflesianas drink a lot, too. Thinking of sending them to AA.