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I assume by 'add vectors' you mean add vertices? No, you can't do that in a morph.
The only way this would work is if you make a morph using your mesh as base and your modified mesh as the morph. Both would have to be one mesh, not layers - either the combined head and extra part or just the part. Then you'd have to replace the default EA head with your own which includes the part in the base position. As in making any morph, the ONLY things you can change are vertex positions and normals. Keep in mind that morphs are strictly deltas - they tell vertices in what direction and how much to move. They don't create vertices or add detail.
If you try a DMap, you'd have to put the uv1 of your additional part in an unused part of the standard head/body uv1 map so it won't distort the rest of the head or body.
If you try a BGEO, the vertices are identified by vertex ID so you'd have to number your additional part with vertex IDs without changing or duplicating the IDs of the EA head.
All that said, I've done this myself using a BGEO by making the extra part as a separate mesh, giving the vertices IDs in an unused number range, making a morph of that mesh, and making the BGEO. That was for a body part so this method works with bodies as well as heads, and using a BGEO in this way ensures it won't conflict with other body morphs while it can still be uv1-mapped to a spot where it'll move with the standard body sliders. (For a face part, it may not be possible to make it move with all the standard face sliders.)
It's not a simple thing to do. If you go ahead I'd be happy to help with more info and troubleshooting.
PS, if for this particular project all you need is for this part (Bajoran nose ridges?) to appear for certain sims, you might be better off with an accessory. It might be possible to give it a single vertex ID matching the closest face vert ID to make it move correctly with the face morphs.
Please do not PM me with mod, tutorial, or general modding questions or problems; post them in the thread for the mod or tutorial or post them in the appropriate forum.
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