ACH setup to Send from a different email

I'm working on setting up ACH for different internal groups and need to send the ACH remittance advice from different email addresses. Initially, I was hoping this could be done with BI Bursting but the more I've dug into this it looks like it's a little more involved as I can't change the email being used to send Remittance advice based on data in the report. So I'm going down the road of setting up a separate payment instrument so that I can setup different versions for each email address. My question is regarding the payment instrument setup.

Is it safe to assume that I need to repurpose one of the already defined payment instruments? All payments will be sent from the same bank account.