Good idea!!
And possible, playtesters (haven't own a savegame because playing Divinity II on xbox!) can use some of this savegames to try if it works fine playing the AddOn Flames of Vengeance!
And feel the difference between playing the "Flames of Vengeance" with savegame or without a savegame!
Maybe also a good thing(?):
People who send their savegame to Larian Studios: write down a little about your playstyle, like for example: Pure Warrior, BattleMage, Ranger, Mage, etc etc ....