Special Event Operations - Option to change background color of government and public safety style symbols

[MeganRoessler]

I'm working on implementing the Special Event Operation solution and some colleagues requested a red ambulance symbol rather than the default blue. In our organization, EMS teams are within the Fire Department, and a red symbol would clearly indicate that they were with Fire (red) rather than Police (blue).  To accomplish this, I needed to export the ambulance symbol from ArcGIS Pro, edit it to have a red background in Illustrator, export to .png, and upload and share on AGOL for use in the Special Event Operations maps and apps. 

Similarly, I made copies of the ATV symbol to indicate some were provided by the Fire Department (red) and some by the Police Department (blue). 

It would be helpful to have an option to change or define a background color for symbols in the government and public safety styles within AGOL to facilitate changes such as this.