Add CC, attachment, alter "from" on email triggered from Inv. "To be Emailed" fi

We have a routing process that allows one employee to create an invoice and specify an email recipient, but without actually sending until the invoice is approved. The resulting email sends from the approver's email address and contains an html version of the invoice.

There are a couple problems:
Usually we'd like to add a CC (like the creator of the invoice or accounting)
Adding a .pdf of the invoice would be ideal for most clients
The "from" address should really be the invoice creator

It seems like the only way to accomplish this would be through suitescript. I'm not a coding or Javascript newbie, but haven't dug into SuiteScript yet. Can some one point me in the right direction? Can I catch the auto-generated email and alter it, or will I need to generate a new email?