Sorry, I just noticed your question, @thirstylizard. Here is the latest integration: Fmail now email supports standard RFC-5322 email message ID. It will be built into Hook 3.4.3. For questions about the new integration, please reply on that page (Fmail now email supports standard RFC-5322 email message ID).
In short, it’s up to you which script to use, though we feel the latest ones are better because the links it generates are interchangeable with all other email apps that use standard IDs.