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“NOT the Harrier” ? Not really indeed ! Gyroscopic effect act on every (every) rotational mass, even on rotor spool and fans (and if I remember correctly, Harrier has a proportionately biiig fan! ).
….and after having ‘my search’ done during many years of my professional life, I can confirm you that, as I have correctly stated in my post #27, only the gyroscopic effect - among those you listed -is the only one that applies also to jet engines – including the Harrier’s one , though me too I have no idea how this aircraft behaves .But I am sure engine and bearing designers did a lot of homework to take it into consideration in their design ! !