Unfortunately, HipChat doesn't support custom status icons. Your best option is to use status messages along with the existing status icons to add detail to a user's presence (e.g. Setting available/green presence with a message of "WFH" or "At home office").
FYI - as a quick shortcut, presence can be set from the message input by using slash commands like /here, /away, /dnd
Plugins (i.e. addons / integrations) don't support modifying status icons as one of their points of interface. You can see a list of interface points at https://developer.atlassian.com/hipchat/getting-started
...from the beginning. We have built up a lot of content in HipChat, with it being a core tool in our distributed company model. While it is true that we didn’t need to move to Slack immediately, we felt it...
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