that sounds very possible to me..
I looked at Thom's 1927 and Seafort gardens is there at that stage but the numbering is different, whcih suggests that there were several changes over the years :
1927
Seafort Avenue (from Sandymount Green to Strand Rd)
nos 1 to 11 (odd numbers only), 2 shops, the others are houses
15-25 labelled 'Seafort Terrace'
jct with Wilsons Place
27-41 and 2,4,6 & 48
Here is Seafort Villas
Nos 10-40
Seafort Avenue West (off Seafort Avenue)
section 1 nos 1-9 (odd) labeled Dromard Ave
sct 2 nos 2-22 (even) labeled Dromard Terrace
sct 3 nos 25-28 (all) labeled Seafort Gardens
no Killeens that I see anywhere on the two Seafort Ave's but here's a list of the surnames at the Gardens section :
Green, Kaye, Bell, Dolan, Murphy, Brazil
Duff, OConnor-Kavanagh, Carroll
Treacy, Connell, O'Keffe, Sexton
I'll work backwards and forwards from this and see what turns up..
Shane