may be a problem.
The ribbon cable is very delicate and may present major problems when you try to connect the "very thin" wires to the existing cable.

What may be a better, or just different, idea would be to see if you can find a ribbon cable that has the right connectors on it already.
One end for the optical drive and the other being the reverse of the optical drive connectors so that it plugs into the drive end of the original.
Probably a long shot finding one of those.

Good luck