Well as it happens I had to go in to Dublin this afternoon after all.
I am afraid I found no index reference for the birth of ANY Phoebe Ward (first name or midle name) in the years 1917 to 1921. (I also checked Warde, and Irish versions of the surname: McWard, McAward & Macaward.)
BUT I wouldn't give up hope: in Thom's Directory for the years 1918 thru 1923 I found 2 persons named Victor Ward - do you happen to know whether Albert Victor was known by his middle name ?
I think one of those Victor Wards probably had the initials VP, so he should go on the back burner. Leaving Victor Ward, 1 Howth View, Ringsend as a possibility.
So there seems some reason to be hopeful, but not much as yet.
Adrian