'so exceedingly' is a correct and usable phrase in written English.
You can use it to emphasize how extremely something is, such as in the following example: I am so exceedingly grateful for your help.
They were declared so exceedingly comfortable that Muji reconfigured its entire sock-manufacturing process to produce them at scale.
They looked so exceedingly normal and suburban, it was easy to transplant that image on to families I know.
Elephants are under critical threat all across Asia, especially in India and Thailand, but the situation is so exceedingly bleak in Vietnam that wildlife conservation groups have essentially thrown in the towel there.
We know they can be very good indeed for children, young and old, and better still when they are in a good relationship with the mother (or, in these strange days, the surrogate), so why is it still so exceedingly difficult fully to be a father?
Given that prevailing ethos of constant availability and self-importance, there must be a simple risk for a politician in being the last person left reading by a Tuscan poolside, white wine at their side.But it is also partly a question of common decency, I think, especially in an age of 24 hour rolling news, when the decision by a leader to stay on holiday is so exceedingly visible.
Some of the parts for the restoration had to be hand-made because today these cars are so exceedingly rare.
His manner of doing so was exceedingly elegant.
Without the cap-and-trade umbrella, that same set of standards and subsidies will accomplish very little, and do so at exceedingly high cost.
He does so in an exceedingly halting fashion.
Until now, George W. Bush has looked -- in this way as in so many -- exceedingly lucky.
But such falls off bikes are rare — exceedingly so in mature urban cycling systems.
