echoing the anon above me, but this is absolutely fine! icons are icons. it's the same character, you're not using fanart without permission, and it's not any different than taking a character from a specific canon point while also using icons that come from canon points later than that. unless there's some very specific visual aspect of your character that changes after your canon point that can introduce major confusion to your tag partners when they make assumptions about your character's appearance, i don't see any issue with it whatsoever.