/ns saset <nick> noexpire on
/os sqline add +0 <nick> Reserved for Official Channels Founder
Unlike Nickserv you don't have to be that nick to ID to ChanServ as founder, so anyone you want to grant founder access to they just: /cs identify #Channel <password>
As a security feature you should lock out real founder access by typing: /cs set #Channel securefounder on. This will help prevent people from changing the channels password or transferring ownership.