Sorry to add a third option to the possible second kiths, making things worse
The Elemental Kith of Blightbent is another option, given their Caustic Caress. That power does mesh well with the poisonous touch via bladed fingers. The lack of variety in what your 'ling can do now could be due to escaping. If your 'ling was creating the drugs, not generating them, then the Wizened options are better thematically.
Was your 'ling also involved in the operations or just the abductions? The former could lean towards Chirugeon. Latter I could see working with Brewer of Blightbent.