I'm not so certain that relocating the outlet presents a huge problem; and the effort and expense in doing so might provide some benefits IF the relocated discharge-outlet is fashioned as a pipe-conduit that is somewhat larger in diameter than the fill-pipe AND is extended to the deepest depths of the pond. This arrangement would potentially benefit the pond by constantly discharging the deepest (poorest quality) water as it is displaced by diverted water from the stream. An emergency overflow would still be needed to accomodate heavy rain/snow-melt run-off that exceeds the new discharge-pipe's capacity.
