That's the primary advantage that I see in the suggestion to use ¡ as that sigil. To ease the typing burden, .await could be permitted as an alternate form that rustfix would canonicalize as ¡await. To my eye, ¡ has almost as little visual noise as . while being obviously different from all other operators.
¡ also has potential as a future low-noise pipeline operator, should the lang team need one in the future. I think such a single-character pipeline sigil could be preferable to the harder to learn (IMO) and more parse-ambiguous |> double-character pipeline sigil used in other languages. The obvious analogy between . for method chaining and ¡ for pipeline chaining makes such a choice attractive to me.