ETH will mine just fine with 2 gb of ram, the dag is about 1600 mb right now so it will still work for those cards for another 6 months. You can do decred as you mentioned, feather coin, and digibyte. There are a few others but ether has the best profit where others are about 40% less or so profit.
I tried this some month ago - and it doesn't work.
I did read forums for more than a week and didn't get it running - so no... it isn't possible atm.
Even if I set max alloc to 100% and do some other modifications it can't create the DAG.
Someone told me that there is a specific driver (which is some years old) which might be working... but that's all venture.
If I would get it running I would mine ETH for sure.. but it's just not possible with those cards.
https://bitcointalk.org/index.php?topic=1395481.new#new