Though I actually wonder...
They went as far as assigning a flower name to all those collab characters (Millim - Chinese Pink, Shion - Nokongiku, Treyni - Schefflera), so maybe in time they'll get a reworked version into proper flower knights?
It's really surprising to me they didn't use those flower names in the 18+ version along with proper artwork - maybe it's the limit of how many designs they could prepare on time?