Hi,
I would love to get this in place, but I currently don’t have anything ready as I simply haven’t been able to figure out how to override the default redirect on SP2013 to let you save and refresh the same page again, This refresh in necessary to avoid a save conflict when you hit the “original” save button later in the edit process.
You might be able to use the approach suggested by Keith Hudson here:
https://spjsblog.com/forums/topic/adding-save-and-stay-on-page-button-in-edit-form/
If someone have additional information, please post it here.
Alexander