I've bought some Condessa Ultra-Clear Rapid Finings. They're veggie friendly and bloody expensive at £4.75 for two kegs' worth. Mine are loose-packed, pictures later for the curious, but the box is supposed to look like this:

I know they're not necessary, but I really want my Great Eastern to be clearer than my Wherry for this summer's ale dabblers.
Anyway this is my query. The instructions say move the beer into the barrel after fermenting, then mix in sachet A into a pint of the beer and stir that into the barrel thoroughly, then do the same with sachet B, THEN prime as normal.
The thing is I would normally have added the priming sugar mixture before the beer. So do I just make the priming spraymalt up as per usual and stir this into the beer when cooled AFTER the fining procedure as it ssuggests? And won't all this stirring have any oxidising effect even if I'm careful about splashing etc..?
If this is all okay, I'm also going to dump in a muslin of hops too before sealing the thing up, gassing and venting. I'll retrieve those after a week in the warm and a week in the cool before a further two weeks in the cool.
Anyone see a problem with 'the order of things'?
Thanks very much for wading through my musings as ever, cheers.