Using a good ol SM58

Using a good ol SM58 and an Audient ID14 interface I want to automate delays for live Rap performances. Has anyone tried this? Here’s how I *think* I can do it:

– play the track in the Arrangement window

– use 2nd audio track for the mic/vocal (assume I know how to set the Audio In’s and Out’s for the mic to be audible via the interface)

– use Delay plugin on Return track A and turn up the Send volume (20/30/40%?) on the mic/vocal track

– set Delay settings accordingly (prolly qtr or 8th notes for short bursts)

– use automation envelope in the Return track to simply turn the Delay plugin off and on – OR – turn the Delay volume up or down – OR – use automation envelope in the Vocal track to turn the Send percentage up or down

Is there something I’m missing? Is there a better way to do this?