Since version 2.1.3 enchant 2 has support for parallel installation.
Given the API/ABI breaks it would probably be best to package this as a separate enchant2 source package
NEWS: 2.1.3 (November 26, 2017) -------------------------- This release adds support for parallel installation with other major versions of Enchant, and fixes a crash in the Voikko provider when it has no supported languages.
