Every local’s favorite (Canadian) television anchor, NY1’s Pat Kiernan, has not been shy about his desire to replace Regis Philbin on morning TV, telling New York last year, “Live! is a rare intersection of my two specialties” — New York City and pop culture. While he said he wanted a weeklong tryout as Kelly Ripa’s co-host, he’s been tapped for one day instead, and on March 7 will appear alongside Ripa and guest Willem Defoe. Kiernan is predictably “very excited” and “nervous,” while his obsessive Facebook fans are over the moon.