Although this may be a bit late for some, I received an inquiry this morning asking for Simple English Propers for the Solemnity of the Annunciation, which is celebrated today. We are now completing Feast and Solemnities as the last leg of this project and the complete draft will be done immanently, however the Annunciation portion is not ready to go yet.
I took a look at the Introit, Offertory and Communion that are sung for the Annunciation, though, and they are exactly the same as the Fourth Sunday of Advent. So if you still would like to sing the Annunciation propers today using SEP please feel free to download and use this score.