Second, we'd like to see some kind of typing-sig delegation. For PEPs like 655 (Marking individual TypedDict items as required or potentially-missing), which only affect typing.py and external tools, consensus on typing-sig is by far the most important consideration for accepting or rejecting a PEP. If you could appoint a person (or committee) you trust to speak on behalf of typing-sig -- that is, seek consensus on the list and fairly summarize it -- it would simplify the decision process. It could even be the first step toward delegating typing-related PEPs entirely.
I've also been thinking that a standing delegation for non-syntactic typing PEPs makes sense.
If he's willing to do it, Guido would be the obvious candidate for a standing delegation.
I would second Guido, but Jelle seems another obvious candidate to me as someone who is not only very active in all matters typing (mypy, typeshed, typing), but is also experienced as a PEP editor.