So this will probably be quite hard.

-help and -helpers aren't special channels for the bot in any way, other than for one command (!helper) which has these channels hard-coded - there's an existing task for making this configurable which will probably need to be fixed first, as this is related.

Things that I think need to happen:

• Storage and configuration ability for cross-channel command authorisation
• Per-command setting for default target (such that !helper always triggers in -helpers)
• Target adjustment for command redirection, I agree that > #channel is probably the best, as an extension of the command redirection syntax: Redirection ::= '>' ' '? Nickname? Channel?
• CommandHandler or similar handling to redirect messages based on authorisation

As a quick estimate, 2) will take at most 30 mins, 4) will take about an hour, 1) will take a few hours due to necessary schema design and changes, and 3) will probably take a couple of hours too, due to the testing requirements.

Command redirection syntax: