I advise against stocking GSH in a big bream pond. They can tie up a significant part of the ponds biomass for several years that you would rather have in BG.
In fairness: Overcrowded Bass WILL reduce GSH numbers in a few years, and GSH stocked concurrently with the Bass will not have a big head start to get to as large a % of the biomass as my GSH did (1 year head start).