This doesn't quite answer your question, but...
In the 17th century several contracted negative verb forms came into use – among them don’t, won’t, shan’t, an’t (an ancestor of ain’t), han’t, wa’n’t – that are noticeable because their pronunciation differs rather markedly from that of the positive elements from which they were formed...
More at Merriam-Webster's dictionary of English usage
Apparently don't was the original contraction for all persons (we, you, I, they, etc.), and doesn't is a later form. So maybe it's not that odd that the expanded contraction "do not I" don't (ha ha) look right to us now.
Although, interestingly, a line from Jane Austen:
"I have always admired her complexion," replied Emma, archly; "but do not I remember the time when you found fault with her for being so pale?..."