Wouldn't it be possible to go airside at 2G and then take the bus shuttle to 2E as transferring passengers do (it may look weird as you will be in the opposite of the normal flow but I do not think there is any human control)? That way I do not recall having to pass security again when reaching 2E.

Regarding lounge access at 2E, it is still a different matter but dragons might be less reluctant than security agents. And what a painful process it would be to eventually have to say goodbye anyway!