! 
 I am very tempted to say "Just because 'many Kapampangans use it' does not mean it is correct." Though I must admit I was rather overbearing to say that it does not exist.  It would have been better to say "Kk is not traditional."  Perhaps a heavy influence from Tagalog. 
 I wonder, though, what the authentic capampangan alphabet dictatesdoes it include Kk ?