"key means of" is correct and usable in written English.
You can use it when you are referring to something that is important or necessary for achieving a certain result. For example, "Research into renewable energy sources is a key means of combating climate change."
International mail is a key means of furthering economic, social, and cultural links between nations.
The other key means of ensuring fair play in American football, basketball and baseball is the draft process.
Hare's other key means of creating conflict is to view Colin Powell as a stern realist in a Bush war cabinet made up of deluded fantasists.
But, finally, it is possible – just possible – that this key means of rigging Britain in favour of a small elite faces its reckoning.
She calls this doing "double duty" and says that these strategies are of particular importance in places like Belize where fishing has been a key means of subsistence since Mayan times.
Tours of their expansive Nashik site, with a step-by-step guide to the wine-making process, cost an affordable 350 Rupees a person and are a key means of raising awareness, attracting more than 200,000 visitors last year.
Interference mitigation is another of the key means to improve energy efficiency.
Statistical estimation protocols are one of the key means to ensure that independent and objective information on product accuracy is communicated to end-users.
Loss of a key means loss of identity on the network.
One of the key means used to check disparity in left and right images of a stereoscopic image is the block-based edge information measure.
Key: mean age of respondents: 24.1 years (SD: 5.04), median age: 23 years, range: 18 to 41 years.
