Your gear list looks a little on the heavy side for Orizaba. I took a trip down to the Mexican Volcanoes last February.
If you're going on the standard Routes for both Izta and Orizaba
Worn on Orizaba Summit Day
Icebreaker 200 fine Long Underwear
Patagonia Dimension Pants
Lightweight Merino Wool Zipneck
Rab Vapour Trail Shirt(worn to 16K)
Patagonia Dimension Jacket(worn to summit)
REI Polartec Wind Pro
BD Ice Gloves
In the pack:
Extra Warm Hat
Marmot Belay Parka(put this on at the top when we stopped moving and on the way down)
I was very happy with this system and wore even less on Izta
We did not need crampons or ice axes(just poles) for Izta
I also wore single boots(La Sportiva K4S) as did my climbing partner(La Sportiva Nepal Extreme). Plastics are overkill unless you get cold feet easily. You'll never be out more than a day as Orizaba is a day hike to the summit from the hut(where you get dropped off by 4x4 service), and we also did Izta in a day from the trailhead.
Hope this helps.