Universal didn't do those two commentaries. They were done by Kinowelt, and I believe the owners of the copyright in this country would be Studio Canal+. Universal would have to license the commentaries from them. They would also have to figure out how to make a commentary recorded for PAL sound good in NTSC. The human ear will notice a slowed-down voice much more easily than a sped-up one, and no one wants to hear what sounds like John Carpenter on Quaaludes. The commentary for Starman was thankfully recorded at NTSC speeds, and is sped up on the PAL disc.
Actually I wouldn't recommend the French releases for those movies. Many more extras are available, but transfers don't look so good to me.
They live : French R2 disc is heavily cropped : see comparison here.
Vampires : French R2 disc's color palette looks off to me : see comparison here. I don't know in which theater Nicholas Sheffo saw the movie, but when I saw it in a theater back in 1998, it looked just like the R1 Superbit disc...
Ghosts of Mars : French R2 transfer looks too green to me and encoding is not as good as the R1 disc : see comparison here.