The phrase "with a startling" is correct and usable in written English.
You could use this phrase to describe a sudden change, as in the following example sentence: "He received a raise with a startling increase of 25%."
Exact(60)
With a startling set at Glastonbury?
The academic scientists came up with a startling idea.
Meanwhile, on the other side of the world, someone came up with a startling idea.
But the staging does end with a startling nod to the opera's dark side.
He's a savant, with a startling memory that sometimes resembles Dustin Hoffman character's in "Rain Man".
Once ashore, he tools up with a startling amount of weaponry.
It's some of Dolphy's most advanced work (and, again, it's recorded with a startling immediacy).
He held with a startling second serve and appeared to remonstrate with the culprit.
It began with a startling, inexplicable explosion of anger over a seat on a D train.
Chainsaws revved and glided through giant logs with a startling ease.
But O'Reilly's regular-guy act is delivered with a startling degree of arrogance.
Write better and faster with AI suggestions while staying true to your unique style.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com