Is there CSS to change full name to username in the task list?

We recently started using the Task List Widget for checklists and we have run into a couple of challenges. The primary one is that when the checklist is sent to the approver the include users full name vs. username. Full name is not unique, and the approver has no way to distinguish who completed the submitted checklist. 

Is there CSS to change full name to username in the task list or specifically the observation checklist approvals? 

I did see an idea to make this configurable, which would be awesome, if you agree please vote it up
Task List Widget - Show names instead of Usernames | Community (docebo.com)

I’m looking for a css or some other kind of hack because I need a solution now.