Is “Did you it?” a valid question?

A yes–no question that begins “Did you. . . ?” is invariably, or mandatorily, a do-auxiliary inversion. It cannot stand alone as an actual non-auxiliary. You have no verb afterwards, because to it is not English. You cannot say any of these:

• Spoke you it?
• Called you her?
• Ran you the race?
• Think you so?
• Called you?
• Gave you it?
• Proposed him to her?
• Have you it?
• Did you it?

in Contemporary English. That is super-archaic. It might not even be understood.

It is very hard, but not impossible, to make sentences with only pronouns but no verbs come off as grammatical. Here is one such example:

“What about the Smiths? I gave her a letter.”

“And I, him.”

But just having a lone, inverted do-auxiliary without a verb for it to help out on is not going to work.