The attacker's belt counters Celerity
no it doesn't. its a swift action to activate, those can only be taken on your turn.
also, on your issue with contingencies: they have more than one thanks to craft contingency spell.
Though, maybe an Arcane Archer could pull this off in core only... when the wizard lacks both celerity and more than one contingency.
EDIT: i'm bored, so i'll punch some holes in your COP argument.
Basically, and please correct me if i'm wrong, your argument goes like this:
COP-tech is dependent on the deity answering the questions.
you then list a multitude of reasons why the deity would refrain from answering. Actually, pretty good reason.
however: in the COP table, the columns say:
true answer, dont know, lie, random answer.
and then in the notes:
You get an true, one-word answer.
Nowhere does it state that the deity has the option of turning the casters question down(though maybe this is what is covered in the random roll. anyways), or that it gets a save, or ANYTHING. it just says: you get a true, one-word answer.