I see that working quite well in any era. In all cases the Scorpion can easily keep up with the Hermes IIs, and in some cases the maneuverability means it's faster. This is always good for a low-tier commander that might need to reinforce any one of his subordinates at a moment's notice. It has the firepower to noticeably hurt anything that won't utterly kill a Hermes, allowing it to provide fire support and/or push an enemy back long enough to get them out of trouble. The armor may be thin in some models, but it's still thick enough to handle the aforementioned threats that won't just roast a Hermes before help can arrive, allowing it to fight long enough for the smaller 'mechs to get away. Finally, most models are focused on an energy weapon, so they can easily handle the long-range deployments a scout lance would be sent on.
And if your lance is using all the latest models of both, it's a DAMN scary strike lance. #P