I agree. You need some movement. Its easy to isolate the movement and flows. But, natural ponds here have definite flow and circulation. Th e spring fed ones at least. You must have a slight movement in man made ponds. But I digress. The bubblers work very well. Or, a cheep lift pump or a barrel lift up and over to a small water fall. Lots of ways to do it. The middle of the water can move,
shelter the edges or "swampy parts" with a wave barrier. I did this in my old pool and it worked well.
It does not have to be all open, it can be stages and creative, it does not need to be all one pool.