Yes,this feast is not a xerophagy day,but you cannot say it's a "non-Lenten day".
Yes, I can, and quite easily.
If this feast falls on a weekday of great lent,the hours are lenten;for vespers and matins,the hymns of triodion are chanted(together with the hymns of the feast),and the prayer of Osios Ephraim be said with great metanoiai.So,there are very clear lenten characters for this day(if falls on weekday).
(a) Divine Liturgy on a weekday (non-Lenten)
(b) Great Vespers with no Lenten hymns (non-Lenten)
(c) Orthros with Great Doxology (non-Lenten)
It's a simple case for it being theoretically "non-Lenten" in a sense (i.e. colors are bright, Lenten prayers are not read, etc.).
What do you mean " when the feast is moved."?
Last time I looked at the Typikon, if Annunciation falls on Holy Friday or Saturday, it is moved to the feast of Pascha.