I've read that the recommended method for option selection is to use option chain provider to only add contracts
that are needed instead of using the universe option filter, as this will be about 10-15x faster.

But it seems that it's not possible to use the greeks to filter selection, unless already subscribed to the option chain, which means OptionChainProvider can't be used - Is this correct?

Alternatively is it possible to remove an option chain from subscription once a specific contract has been selected using the greeks, and then only add the specific contract?

Any info appreciated.