I doubt you'll be able to do this from a plugin. You'd probably need to replace the library entirely with a compatible library. I don't see why you'd even need or want to do this though. We've also the below triggers available that are triggered early in the mailer process.
onBeforeCreateMailer
onAfterCreateMailer
Those can be used to modify the mailer object. It's passed by reference so I suppose you could replace the object, but if it's not a compatible object it'll just break the mailer.
onBeforeSendMail
onAfterSendMail
The above can be used to replace the various information of the email (e.g. subject, body, email addresses, etc...).
Kyle (Krileon)
Community Builder Team Member
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