It takes forever for my sparge to drain, so my wort collection takes some time. I collect about half in the boil pot and the rest in a couple smaller pots, bring them up to 180 deg (like Oceanic mentioned) and leave the covers on for a propane boil the next day. It adds time overall to reheat...
You can bottle carbonated beer from a keg if you shut off the gas flow and bleed off most of the head space. Then slowly fill a tilted bottle and cap it. If it's too slow, goose the keg with a little more gas.
My wyeast American ale 2 starter liquid tastes a bit tart and malty, not delicious, but not unpleasant. At least until I used Mother's Day counter cleaner to "sanitize" my mason jar instead of the star San that was also nearby. Doh!
8c is probably at the low end of your lager yeast's range, but not out of it. Wyeast 2124 is rated 45F-55F. So while warming the ferment is all it likely needed to get more active, exceeding these numbers is not recommended for a clean lager. The exception is for a diacetyl rest of about 60F...
I'm always looking to brew more efficiently, so I can do a batch on a weekday after work (2:00 pm) to dinner time 6:00. My mashes are like 2.5 to 3 hours strike to kettle, so it ain't happening. I think I'll check out your biab and do a concentrate /top up brew on the stovetop and see what happens.