Should we keep our EBCH on the Stocks.exchange for the swap or should we send to MEW ?
You don't have to do anything now. Swap will happen in June 2018 right on our exchange Coinpulse.io There will be a separate page for Swap. You will move EBCH to CoinPulse.Io in June 2018 and then swap it for the exchange token, CPEX.