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The charger should have reverse polarity protection anyway so give it a try and see if it works.

Look around, you can get them for any size lipos. Also, you can use the 6S cables for anything between 2S and 6S.

As long as nothing is around that can catch fire, then they don't need to be in a bag. The bag just helps to keep the flames from shooting out 2 feet in any given direction. You may want to invest in an ammo can, paver or some other non-flammable yet sacrificial item so if something does happen...

That cell isn't off enough to hurt anything. Like DavidB said, it will balance out. You should set the charger on balance to balance change. If you're on the LiPo setting it should automatically cut off at 4.2V/C (or at least most chargers do) but Id set it to 4.2V just to be on the safe side.

The slower you discharge it down the safer it is but there are always risks so make sure you are discharging the LiPo outside in some sort of non flammable container. Some people use an ammo can, some use cinder blocks, and some people will use their grill.

Just build/buy adapters.

Hard to say, when you say a few years is that 3-4 years or is that 5-8 years? 3-4 years you might be ok if youve been maintaining and cycling them once every year but if they are older than that or theyve been sitting without maintenance then they are probably bad. As the others mentioned...