Cool - but I don't think adding more experience gain is a good idea, you level pretty fast anyhow. We got two games in today and each of us leveled four or five times.
A lot of these improvements are well thought out, though I think the game does a great job with everything. I like Koyote's balancing mechanic, and I think an overall campaign goal is nice. The one in the book, Transcendence, would take a very long time to achieve, so maybe something a little easier like "learn all spells from your school" or something. Or just a set number of games and whoever is highest level wins? Or you could do a campaign map somehow... Just some thoughts.
Glad you're organizing something! I want more Frostgrave, every game I've played has been a blast.