The whole conflict thing does get a bit arcane
You can submit a turn using 0.8 if you absolutely have to - it's similar enough to 0.7 that you can issue orders llamaserver will understand. However, while you're using 0.8 and llamaserver isn't, you won't get access to giants at any time and I don't think you'll get your spells back either. It is possible to alter mods on llamaserver mid-game (just ask llamabeast nicely, and have a good reason for doing so), but in this case I think doing so would break your game for good.