It would help to outline specific policies and strategies a meritocratic government would be implementing- http://www.telegraph.co.uk/news/0/at-a-glance-key-points-leaked-labour-manifesto/
Yes, most meritocrats will definitely be able to agree on putting multiple types of human talents/intelligence at the top of human priorities on this planet, and thus, those skills are most needed in a balanced fashion at the top, without any narrow analytical elite. I think that's very straightforward and a given.
What's on offer with any specific Meritocratic Government, however, should be clear from its general messaging, rather than something to worry about continually. If you focus on policies rather than values, you will make interesting progress. That's how you'd be able to tell what the other person is thinking like. Watch some Labour MP interview videos, maybe.
You want the priority of valuing merit, hard work and talent to be at the core of meritocratic policies. So that's obvious. So now, how would we come to agree on the best meritocratic policies for running a country? Through science and thorough discussion. There's not any cause for concern here; this is all quite straightforward.
Anf if you are worried about a minority of secretive thinkers stealing away power for themselves -- don't you think we already live in such a world? Not to mention, such a thing would be out of your control. So why bring that negativity into this? Though it's a valid concern and needs to be brought to light.
Personally, I think some fundamental policy ideas are the access to education and research (JSTOR); the access to human habitable housing, a fully funded social health service, access to a Living Wage, access to a reasonable level of cyber security and Internet privacy.
Funding is the next issue. The inheritance tax and a Robin Hood tax on all banking transactions (0.02% - 0.5%) seem like very fair ideas to fund all the basics of a more equal society for everyone (equality of opportunity, not outcome).