Ranger - "Higher Vampire" [5th Campaign, 5th Mission]

I'll slightly digress. I have an idea to try playing through this campaign, and all the others, next time, changing the character build strategy from the recommended one for each faction to a non-standard one. That is, I'll abandon the skills of Might and Magic: Attack, Defense, Chaos, Light, Darkness, and Summoning. Instead, I'll use skills like: Leadership, Luck, Mechanics, Education, Logistics, and Sorcery. I wonder if it's even possible to complete the game... at least on Veteran difficulty.