I don't know about the Bumblebees, but the bee shrimp are not much different from CRS. But you could try, some people have success breeding them in hard water, as long as the parameters are stable.
yes the person im ordering them from says she is keeping them in water with a pH of 7.4 so im sure with those 2 tiny pieces of driftwood and the one large(for the tank) piece i forgot i had in my 29g the tank should be just about perfect and if not ill just mix distilled water with my tapwater to lower the pH and hardness