I'm well aware of the (lack of true) financial implications but I still get the urgency and need to speed up because of the violation and shock that someone is

I'm well aware of the (lack of true) financial implications but I still get the urgency and need to speed up because of the violation and shock that someone is impersonating me RIGHT NOW! It feels similar to a physical threat, or enough so that our bodies react the same way. It is really hard to develop control unless you're exposed to this situation, so I like your strict yet general rule to (a) classify the situation, (b) slow down. Even enough time for 10 deep breaths is likely enough to get you centered and thinking clearly.