You could use periodic infusions of Owl's Wisdom to help compensate for the ability loss...But there's no way to recover lost ability points short of rest (which only heals temporary ability drain) or spells from the Restoration line.
Potions of Lesser Restoration aren't expensive though. A group that lacks clerical/druidic healing would do well to have a stockpile of Lesser Restore, Cure Disease, and Neutralize Poison potions...in addition to the more common Cure potions.
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