Email: Ability to store default email messages for selection email window

We send different invoice types and it would be good to be able to store multiple email messages for when we are batch sending invoices.

For example, our day-to-day invoices use our default email message stating that the invoice is ready for payment.  However, we also send via batch, invoices for paid recurring invoices.  At the moment I have to change each individual email message which is extremely cumbersome.

Is there a way we can save several email messages when sending invoices?

Example

1. New Open invoice - sent to accounts requesting payment
2. Closed Invoice - thanking the client for ordering, order is now being sent
3. Recurring invoice - advising clients that their payment will be automatically deducted from their nominated account.

"Option for multiple email messages"