An invention machine that would automatically make overloads?
There are controls you can add/decide on implementing this such as requiring level 99 Herblore and not rewarding any XP. If you still want players to experience the mass making overloads grind then you can also add a requirement (1k overloads made) to unlock this device.
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I think it should go beyond Overloads, honestly. It could autobrew any potion if given the supplies, at the obvious costs of Charge and not getting any XP whatsoever. If people want to throw perfectly good XP away for the sake of mass production, who are we to deny them?