Can the TNF Himalayan down suit perform as an adequate substitution for a sleeping bag on Aconcagua, if I were to pair it with a thermolite liner to reduce pack weight and space? If there are concerns for my hands and feet, I have that covered with TNF Himalayan mitts (primaloft Insulation and 600-fill RDS goose down insulation) and the insualted boot liners from my La Sportiva Spantik double boot for my feet to sleep in. Plus I won't be exposed because I'll have a thermolite liner as well. I wouldn't only be bringing it to sleep in/lounge around in camp. I would be wearing it on summit day as well, even if it's a bit of an overkill for Aconcagua. I was told my situation is kind of like gloves vs. mittens. My suit may be 800 fill and warm, but my extremities are individually covered in it, kind of like a glove as opposed to being completely covered like a mitten -- hence sleeping bags. And we all know mittens are warmer than gloves...but that's where I thought a thermolite liner paired with the suit would counter that argument. Thoughts? Thanks in advanced!
P.S. I have a synthetic Marmot Tresle 0° sleeping bag. But it wouldn't be warm enough for Aconcagua and I'm hoping I can get out of having to drop another $700 + on a new -20, down sleeping bag...
P.S.S. I got the TNF down suit at half price of what it normally runs -- which can hover around a grand. I really want to take advantage of it's uses for Aconcagua, with 8000-m peaks on the radar at some point in the future!