Ability to change "from" address and other fields per email variant

The ability to change the “from” address and reply to etc (fields form this screenshot) per email variant would be greatly beneficial.
We often send emails where the send name and email is the CSM… but here is always a handful that need a variant, maybe an account is in transition , or they are currently assigned no CSM.. - I need to be able to set variants with generic tech-touch email address OR utilize a manager’s email.
Note: I know there is a workaround with calculated fields but the time required for this is too much. (and multiplies if you have more than 1 source query)