I think my usage of the word "meaningful" was very much generous. Let me clarify my intention then: the "correctly" (that is, preferred by speakers) reversed text is unlikely to have a meaning, but it is still likely to adhere the language's phonotactic rules. ゃ (small ya, as opposed to ordinary や ya) is something you never expect to be the first character because it modifies the preceding syllable. The use of such small characters (すてがな sutegana) as the first character in words is very limited in Japanese.