I don't...THINK...static discharge would be a problem? There's a youtube vid out there, showing a guy using an ignition coil to throw massive sparks into a little pile of black powder, and the powder never did light off. The granules are coated in graphite, "they" say, which is fairly conductive, and contains a fair percentage of carbon, which, ditto. Other than that I couldn't say. Would I bet my right hand, a trip to the hospital in an ambulance, and thousands of dollars in medical bills on it? Probably not.
Anyway, you'd need a separate measure. When using a flask in the past I always used the flask spout and valve to throw a measured charge, but then I suppose, at a formal range, the range Safety Nazis would gang-tackle me for doing that. Does this, with the above paragraph, make me a hypocrite? Maybe... Each has his own comfort zone in certain circumstances.
I never bring a flask into the field anymore, being that my "flask" is now a bench-top powder measure from which I throw charges into paper cartridge cases. For me the only reason to carry a flask at all would be test new loads, to select powder type and charge weights for the paper cartridges.