This would allow quick changes to a host of links - especially useful when reusing layouts but changing images, content and links. A panel would allow the changes to links, and campaigns. It could have several columns which could be used to construct the links. Here, with examples:

URL
https://www.example.com/page.html

SOURCE
(would add &utm_source=xxxx to the URL)

MEDIUM
(would add &utm_medium=yyyy)

CAMPAIGN
(would add &utm_campaign=zzzz)

etc.

Many of the details in these columns would be identical throughout a new piece and being able to edit them all in one screen would be both a time-saver and a way to avoid errors and ensure consistency.