Okay, I'm clarifying it, [ahnt] I?

The contraction of "am not I?" is pronounced [ahnt], that is the same as "aren't" from "are not", and "aunt" an elderly female relative.

How do we spell this [ahnt]? My point is that an't would be a reasonable way to spell it, to match can't ([cahnt], as in Immanuel), and amn't is also found in dictionaries, obviously mean to pronounced [ahnt] (the same as an't/aunt/aren't). In practice, however, the spelling aren't is chosen.

But Americans pronounce aren't = are not with an R, don't they? So do they/you also pronounce it with an R when it comes from am? Or is it just written that way faute de mieux, for lack of any other agreed spelling? Does it worry you that, in your dialect, the process of contraction adds an R?

I think what you're trying to convey by subtle signs is that you personally pronounce an R in aren't I?. Aren't you?