Summoner's Doublet v Caller's Doublet +2

[Moink]

For those who don't have one or the other:

Summoner's doublet
[Body] All Races
DEF: 38 MP +20
"Blood Pact" ability delay -3
Avatar's critical hit rate +3%
Depending on day:
Avatar perpetuation cost -3
Lv. 74 SMN

Caller's Doublet +2
[Body] All Races
DEF: 50 MP +60
Summoning magic skill +10
Avatar Perpetuation Cost -4
Avatar: Increases Blood Pact damage
Set Augments "Blood Boon"
Lv. 89 SMN

I am in the midst of re creating my Blood Pact Delay macros the largest question I have lies with these two pieces of equipment and IF I can use the Summoner's Doublet for the Delay reduction and swap back to Caller's Doublet +2 before the BP goes off, would I gain the benefits of the +2 doublet?