I don't have much experience with Anorithil but I do know that a Necromancer can go Lichform to get free 1.0 per turn negative energy so you could always grab the Necrosis category and go Lichform with your Adventurer.
That'd solve a big part of your resource problem and it'd only cost 8 points and a cat point, if you wanted to get to 6, which is advisable.
I'm not sure if anything generates positive energy other than abilities but that'd be a start.
You'd just need to survive until level 24 in order to get that Negative energy.
More so, Lichform grants Celestial/Star Fury at 1.1 (at level 6) and so you'd save a category point.
I don't use Adventurers much but that seems like a plausible build... of course, you'd lose infusions in doing so. You might also consider an Ogre for the extra slot and the added stats to your runes plus the extra life. Combine that with the bonus of +3 from Lichform and you'd have a Corona mage with a ton of hit points.
A caveat for this approach is that you need to get lichform to talent level 6 to get the full benefits of it, which is trivial for a necromancer, since they have a mastery level of 1.3, but for adventurer it's only 1.0. You would need to bump it up to at least 1.2 either with an appropriate amulet of mastery (unlikely), the Staff of the Archlich artifact (still kind of unlikely, and only possible fairly late in the game), or a second category point (those are really important to spend wisely, especially as an Adventurer).