I don't believe your gonna get the same utilization from your 0 min hops as Avery is getting.
I brew imperial I PA often. I would add more hops to the boil. Use beersmith to calculate 100 IBUs without the 0 min hops
I agree with BBBF its totally the way to go. When I want to make a starter I sanitize everything and then dump them in the flask. No boiling no cooling. I can make a starter in 5 mins.
Canning day is like a brew day but after that your golden