"instrumental aim" is a correct and usable phrase in written English.
You can use it to refer to a goal or purpose that someone has in mind when they take certain actions (usually involving strategies or tactics). For example, "The company's instrumental aim in launching a new product was to increase their market share."
Among Ircam's aims, as defined by Boulez, were research into acoustics, into instrumental design ("instruments have scarcely changed over the past two or three centuries"), and into the problems of composition itself.
For now, Turkey's role will continue to be instrumental, its aim – to keep two Kurdish cantons separated by a 140km (90-mile) gap, in which Arab groups call the shots – now within reach.
Most of the current instrumental developments aim at improving these areas.
When trying to maintain control over the experienced stress situation, the patient is more likely to activate instrumental strategies, aiming at coping with the difficulty.
Whereas other great apes engage in complex social interactions and cognitive processes, in the end, it is all a kind of instrumental rationality aimed at the individual's personal gains.
Above all the out-patient hemodynamic surgery of the superficial chronic venous insufficiency, which requires a careful and meticulous instrumental investigation aimed surgical gestures, but simple, effective, of brief duration, has convinced many surgeons of the possibility to operate on the varicose patients of a more and more advance age.
So too are members of the 26-piece instrumental ensemble, the aim being that all the sounds occur within the same "space".
But where Wagner saw Beethoven's choral finale as marking the limits to purely instrumental expression, Bruckner aimed for the infinite using merely instrumental resources.
Its main aim remained instrumental in providing a background and overview of the previous work in this subject and therefore it was carried out up to the point where the authors deemed that all elements relevant for transnational CoPKM in health policy were included.
In its second meaning chimeras is thus an instrumental, disposable critical concept aimed at questioning the notion of neatly defined, isolated living entities.
Such techniques have emerged to become instrumental in proteomic projects aiming for systematic functional analyses of the genes uncovered by genome sequence initiatives [ 10].
