Would you answer that there are two spellings, 'm-e-a-t' and 'm-e-e-t'?
StandardIt's very questionable for an 'authority' to recommend nonstandard pronunciation. (if I understand your post correctly)
4 : substantially uniform and well established by usage in the speech and writing of the educated and widely recognized as acceptable *standard pronunciation is subject to regional variations* (Merriam, Webster)
Let's see, in Labov's survey only 1/6 of all respondents from the US and Canada don't have the wine-whine merger. Numbers are even lower in most English speaking countries. I'm sorry, but what was correct years ago is dialectal today. Happens all the time. Think about yod-dropping in the US. Think about the Great Vowel Shift. I'm sure your pronunciation is nonstandard by Middle English standards.