I might add 2 lbs of 2 row to the PM.
A beer that big in the bottle will only get better after a year if you are careful about oxidation.
The hop bitterness and aroma may suffer slightly. Good Luck! It will be delicious regardless.
P.S. Although I went AG a while back, I have used the second runnings of each grain batch fortified with a little DME to make some incredible beers. If you figure those runnings are half strength, then it only takes 2 lbs or so of DME and some hops to get a great batch out of it.
$15 bucks or so for another 5 gallons is still cheaper than the AG batch!
BOTTLED: "Route 66 IPA" 7% ABV, "Dave's Imperial Stout" 12% ABV , "Spider Imperial Stout" 9%ABV , "Mutt Irish Ale" 7% ABV, "Sorta Sierra" IPA's 4.4% ABV, "Habanero Ales" 5.5% ABV, "Pumpkin Seed Ale" 5.5% ABV , "Marzen" Lager, "Step child Ale",
PRIMARies: "Caramel Amber" , "Black Porter"
SECONDARIES:1 :"Miller Ale"
On DECK: Another Russian Stout