ELU, like other Stack Exchange sites, is designed to produce the correct answer, rather than the musings (or varying value) found on internet fora. So as long as you can clearly define 'correct' and explain where your phrase would be used, I don't see a problem with this (though you may find the former requirement easier said than done).
"Why it isn't proscribed", though, is probably unanswerable. English wasn't designed using a set of meta-rules*; if a phrase makes sense and does not breach the codified rules that avoid ambiguity and assist the audience (whichever code you subscribe to), it's legitimate.
- Except in the sense that when the Tower of Babel fell, certain peoples were granted the English language as a special favour; all others had to make do with inferior tongues.