I too am apart of the Aus VFRS and find my watch to suppress critical alerts that are sent through BART…
I have found the only way around this is to turn BART notifications off on my watch, however this also turns off other BART notifications such as events, stand-down requests or other communications which is hard to get to when your phone is 3 layers under your uniform.
It seems to be a pretty dangerous flaw in the notifications system…