I have passed from the same stage some month ago. I also couldnt have the west system slow hardener here in Greece so i had to deal with another resign.
The only thing i would like to mention is that the data sheet of your epoxy says 15 hours pot life but it doesnt says at what temperature and and what amount of resign.
It is very possible that this resign will do the job, but the data sheet doesnt give me the impression that we are talking about a quality product.