The phrase "already devised" is correct and usable in written English.
It can be used to indicate that something has been planned or created in advance.
Example: "The strategy for the project was already devised before the team meeting."
Alternatives: "previously created" or "already planned".
You had young people who had already devised faster and cheaper tests for cancer.
He's already devised a plan to do it in all of Spain for less.
He added that he had already devised a way to make his work for The Herald bulletproof.
He said the service had not issued a recall because it had already devised a testing plan it used through much of last month.
They were political — basically, getting people to agree there was a problem, so that the solutions already devised would be accepted.
It added that "some banks have already devised accounts which compete with free if-in-credit through the rewards they offer".
Tax lawyers are already devising schemes to exploit the many new loopholes the plan would create.
Mr. Parsons, however, said he was already devising plans for various possible developments.
Outside the working group, the participating companies, like I.B.M., are already devising ways to contain the digital flow.
A new generation that has grown up with digital tools is already devising extraordinary new things to do with them, rather than simply using them to preserve the old models.
Gun rights advocates fear that the California legislation will prompt other states to follow -- similar efforts have been undertaken in New York, Connecticut, Illinois, Massachusetts and Virginia, but have failed -- and enthusiasts are already devising ways to alter the gun and so circumvent the law without breaking it.
