Various keys could utilize an icon for styling purposes and/or a clear indication that a the key also supports long press functionality.
Long Press Indicator
With the limited key space it might be ideal to simply include a series of 3 periods (...) at the base of the key or vertically to the right to indicate a "menu" type hint. Utilizing any icons or larger format hints could cause issues with the overlaying content needed to show what the default key function is.
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