Swap Email Template without Re-Building Email

We have instances where clients need to change the template an email is using because of an updated design, a better performing A/B test, etc. It’s frustrating that there isn’t an easy way to change out the email template to a different saved one; we have to completely re-build and re-link the email (in the case of workflows, etc.) if we want to change the template and look of it. Would LOVE to see an option where we can ‘select a different template’ or ‘change template’ in the settings, with the understanding there may need to be some fixes + adjustments, but would save from a complete re-build.