Regan Perry

+1 
Yes please!
How is this a security concern? The details of the change will be logged.
As the OP said, users leave organisations all the time. Just spent an hour manually updating requester for this very reason. 

oh, you know what - that only helps for existing Zendesk fields, not custom fields, as per the OPs requirement. 
Sorry. I'll leave that there though - perhaps it may be the beginning of a solution..? 

Was able to customise the request List Page by editing the page in the theme editor. 

We wanted to show the 'Priority' field, and also allow the user to sort by that column. 
Took a bit of looking around to find the exact right names (and some guesses based on fields displayed on other pages) but eventually got it. 

First needed to add the Heading and make it a link that would change sort order: 

and then the rows get displayed underneath as per: 

The result: