I'd suggest one of the charms we'd probably want is Cecylene's First Excellency. A charm that improves everything you do, as long as you make methodical plans? Sounds right up Lelouch's alley.
Only problem is they're freaking expensive. We'd have to pay for two charms to get it, three if we go to Essence 3, because you have to multiply the price by your Essence, and when your Essence goes up, you have to pay for the upgrade.
Though, considering most of EB's charms are hidden behind Witness to Darkness, we may have to do that, unless we want to loose all Charisma, or try and create an upgrade that removes Witness to Darkness's problem. Though might want to buy both at the same time, if we do it. Well, that is we should wait to buy Witness to Darkness until we have the other prereqs to buy the upgrade charm, so we can buy it immediately after.
Cecylene's Transcendent Desert Creature isn't much good itself, not for his present situation, but has not prereqs, and unlocks Stone Flayer Touch, Sandstrike Blast (which provides the attack we need) and Fingers Through Sand Defense, which provides a PD against physical attacks (at least as long as they don't have more Essence the Lulu.) Combined with Oramus's PD, Lulu would be safe from most things. Also, can get all of these at Essence 2.
Knowing the Desolate Heart would be good for a Social character as well.
Factual Determination Analysis would also be good, and it's Essence 2.