Your choke point is useless against China, if hostility happend and if India use these island as military fortress to carry blockage operation, then its will first to get bombarded and annexe by PLAN invasion units, every tactician or strategist will do that.
Once we secure theses islands, we will use as our outposts to fight Indian navy, no need to mention that we will raid from Tibet plateau...unless Indian assume that it navy is egual to U.S navy
1.) There are over thousand Islands in Andaman and Nicobar chain.
2.) They are home to Indian tri service command, that means they are not only home to Indian Navy, but also have IAF bases(Su-30MKI bases) and army bases.
3. There is reason, why malacca strait is know as choke point..It is narrow stretch water space between Indonesia(Sumatra) and Malyasia running more than five hundred miles culminating in Singapore strait.
4.There can be no feasible Naval deployment from East Asia ..as not only are Malacca narrow, they are also shallow(no submarine movement can take place),
They are the worlds busiest strait.
Ships crossing the strait can be easily seen by naked eye ..from any one of neighboring countries.
A Naval fleet or a CBG crossing the strait would be discovered many hundred miles before they reach their destination.
So you have many problems if you want attack Indian stronghold in the Andaman and Nicobar ..
1. You can not achieve an element of surprise.
2. You can not deploy your submarine force.
3. You can not deploy many units at one time or resupply them
4. You will be out numbered and without air cover..fighting a well dug in force, which familiar with area and can resupplied easily from Indian mainland (no that it needs to, it is self suntanning Archipelago .