I think the easiest way for you is to change the priority icons! E.g. 1,2,3 or something?
You can locate them on you JIRA server under the $JIRA-APP-DIRECTORY/atlassian-jira/images/icons/priorities/major.png
To be sure: backup your old icons into a seperated folder and place the new icons into that folder.
Please give feedback if this is a possible solution for you?
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