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Since unlike a "manel," I don't know who else is quoted in an article until it runs. I have tried recommend journalists talk to other people, with a bias towards recommending female experts, but it doesn't always pan out.
But I don't really feel that's adequate. Do I say, "please make sure you don't only talk to men, because it's kind of a problem in our field?" I could try that. I would also be interested in whether the sex of the journalist matters in the likelihood of writing "marticles."
Cut directly to the chase: "I recommend that you explore this further with [name]. Here is her contact information. She's very knowledgeable about this and will be an excellent resource for you now and in the future." Saves time and trouble.
I do this, more or less, if I have someone specific to recommend on a specific topic.
Thanks for reading! I actually think that based on the importance of your work, you are under-quoted. 
Regarding your question, you are on the right track. Persistence in recommending women colleagues is the key. If a reporter never takes your suggestions, mention it to them.
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