If u get power auras you can import sets - which is basically a pre-made setup for a specific spell/ability. Simply open up power auras '/powa' click on 'import set' then paste this in:
Version:4.9; g:0.9686; icon:Spell_Holy_Rapture; buffname:Rapture; r:0.9843; Extra:true; x:1; bufftype:13; stacks:1; texture:16; alpha:0.7; owntex:true; isResting:0; duration:12; soundend:23; size:0.18; y:-224; texmode:2; finish:3; timer.b:0; timer.g:0.8824; timer.h:1.22; timer.UpdatePing:true; timer.enabled:true; timer.cents:false; timer.y:-224; timer.Transparent:true; timer.UseOwnColor:true; timer.ShowActivation:true
The aura will appear once Rapture has been triggred - the 12 sec timer counts down - when the aura dissapears you know u can re-shield for another rapture proc.