lf I use the new 2.1.2 day wallet will that work with demcats?
If You do NOT using wrong double spent dashcoin minergate, but original dashcoin CLI wallet, yes. And use CLI wallet, only. Not GUI.
How Can I save the dsh coins currently pending at demcats?
You cannot. You using hitbtc address, they are on wrong double spent stupid minergate chain.
I know that I repeating "wrong double spent minergate chain", because You have to realize, this is all minergate fault.