Yes, it is. You can revoke your PoA and sell stocks using the 2FA pin. Suggest you hold on for a few days (a week or so), there are some changes in this process, whereby the PIN to be entered while selling stocks will be sent to you by the Depository - CDSL. This process will go live and the details will be shared on the process to switch from PoA to Pin based selling.
If you want to activate easiest, you can. But upon activating easiest easi*est, we will not show you your holdings on the trading platform to sell. This is due to the risk of client being able to sell and transfer stocks at the same time.