The phrase "a much more constructive" is correct and usable in written English.
It can be used when comparing the level of constructiveness of two or more things, indicating that one is significantly more constructive than the other.
Example: "The feedback provided in the meeting was a much more constructive approach to problem-solving than the previous suggestions."
Alternatives: "far more productive" or "significantly more helpful".
Nawaz Sharif has become a much more constructive player.
He said he and his investment group were entering into "a much more constructive relationship" with Saakashvili's government.
There is a much more constructive way forward, however — if the Europeans can grab on to it before it evaporates.
To help with that, banks "need a much more constructive relationship with customers, with the public, with governments and with regulators," he said.
"Even [Wolfgang] Schauble has said there is no doubt the Greek government is implementing what has been agreed and engages with institutions [creditors] in a much more constructive way," says Tsakalotos.
In a statement to staff members, Mr. Wang denied he had tried to downplay the story but said that the matter "should have been resolved in a much more constructive way" and that the paper's reporting of Mr. Li's death in subsequent days had been extensive.
"Hopeless mess" is not a constructive comment; "name the variables more descriptively, e.g. tmp1 is not a great name" is much more constructive.
Later on the couple manage to engage a nurse who is evidently much more constructive and useful in her response… The older woman tries to engage with a doctor – but is rather rebuffed, I thought, as he turns quickly to leave the ward (Research observation notes, Ash).
Kennedy's approach allows the police to function as something much more constructive: an über-parent.
In my experience as an administrator, I feel it is much more constructive and difficult to do less than to do more.
Some will instinctively blame the government for this situation, but it would be much more constructive to take a close look at the way corporate governance functions.
