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Is it possible in Solidity to check if a function selector exists in an external contract without attempting to invoke said function?

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To my knowledge no.

If you want to check for a view function it may be possible to use staticcall(abi.encodeWithSelector(selector))

statticcall() ensures that an external function calls will not write to the contract while interacting with a function, in case of success it returns a boolean and the data and reverts if the call try to write to storage.

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The other method used, which isn't function specific is to use the IERC165, to see if a contract implements an interface containing a set of precise function headers.

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