Blowing the dust out has a lot of issues. It just moves it somewhere else. On the PC board, on your bench, in your lungs or just into the air to re-settle later. You can somewhat control this by having a vacuum/dust collector/exhaust fan nearby, but it really never works all that well.
I haven't had a traceable ESD incident to using a vacuum, but that proves little as most ESD damage goes undetected anyway, or shows up days, weeks or months after the exposure as a weakened component finally bites the dust.
I agree that the vacuum can build charges easily. When using my shop vacuum to pick up wood dust I frequently get shocked - often several times a minute. For those who generate fine dust by sanding there is a real hazard of a dust explosion which is why serious dust collection systems have formal grounding schemes. But I don't ever recall being shocked by the house vacuum I have used on PCBs. There may be a conductive component in the plastic, the volume of air may be enough lower to prevent the problem, or the charge build up mechanism may depend on the heavy particle load I see in the shop.
If you are concerned it is really easy to set up a conductive nozzle of copper tubing or the like and ground that. Any charge that builds up in the piping system is isolated from your PCB.