What about removing fish from the pond to allow more oxygen for others in case I do start having a low oxygen problem? Would this be a viable theory?
The problem with that theory, as I see it, is determining the number of fish to be removed. You would need to know the present level of Dissolved Oxygen and be able to monitor the DO to determine how fast it is dropping. It also depends on species of fish extant in the pond present day, as tolerance to low DO levels varies with species. Aeration is your only real immediate solution with additional plantings placed for long term stability.
