Basically what you're asking for is a script to join a certain channel on a remote access?
Code:
on *:text:!join*:#: { 
;/j $2
;/j $nick
}
Remove the one ; on the one you want.
/j $nick will join #Nillen if Nillen wrote !join
/j $2 will join #Nillen if anyone writes !join Nillen

Nillens @ irc.twitch.tv
Nillen @ irc.rizon.net