Please, please, oh please add new cgi to these episodes.
The Defiant exterior is not a physical model. It is a cgi model. Move it around more. Add TNG or Balance of Terror style deflector shield flares. Change the photon torpedo fx. Show more Defiant interiors. Add more animated bridge displays. Show exterior shots of the Defiant entering and exiting warp. Show more of the Gorn cgi model skulking around before caught. Show the Tholians in the starbase and in the ships reacting to the Defiant being stolen.
The blu-rays will not have new FX created for them, it's not that sort of project.