Code:
 on *:kick:#:{
set $+(%,kick.,$chan) $addtok($($+(%,kick.,$chan),2),$knick,32)
}
alias F4 {
$iif($chan,echo $chan $($+(%,kick.,$chan),2))
}

Note, if there are a lot of different kicks, you might get an error indicating that the variable length is too long.