RE: Uniswap, Hard Fork Delay, & Other Updates

Yes, that should work. For step 2 the amounts won't be exact since your sale of 3M DEC will lower the price and change the DEC to ETH rate needed for adding liquidity, but it should be close enough and you will just have some extra ETH left over. Alternatively, you can get the ETH tokens from another source so you don't have to sell half of your DEC into the pool first.