If you're willing to consider Therese Bugnet, you're willing to consider rugosas more generally, no?

If so, I suspect the one you're really after may be Hansa. I have never grown it myself to know for certain that it's the right height for you, but I have grown Rosa rugosa and suspect you'll probably be satisfied with its height as a hedge.

I'm sure others who have more experience with rugosas than I have will offer more exact opinions than I can.

I have several Hansas in zone 5 NW Indiana, and they can get much taller than 4 feet. Mine reach 6 feet with no problem. They also tend to get blackspot easily the with bare legs that follow when the leaves drop off, although that may be due to the shade they're in much of the day. My other rugosas don't have that problem.

The David Austin catalog lists several varieties for a medium hedge including Harlow Carr (pink), L.D. Braitwaite (red), Knockout (red), Mary Rose (pink). Tall hedge roses include Carefree Beauty (pink) and Roseraie de l'Hay (rugosa, red).

If you are trying to stay away from pink, Gertrude Jekyll should perhaps not be on your list. She is very fragrant, but she is indeed pink, and perhaps not a dark enough pink to make you happy. And as others have already pointed out, she can get quite tall. Galloping Gertie, as some have called her, tends to put out looooong canes, not exactly what you're looking for in a hedge. I think of her as a climber wannabe.
You may want to consider the dark red rose Lavaglut. Dark red velvety flowers in profusion. Repeat bloomer. Disease free or close to it in a variety of climate conditions. Stays pretty much at 2.5-4 feet. What's wrong with this picture? The primary drawback is the absence of fragrance. Only you can decide how important fragrance is to you in a hedge.
Kay

Thanks for the suggestions :D

york_rose and karl: I've seen a lot of rugosas at Chi Botanical Gardens and Hansa is quite massive over there. Actually except for Blanc double de Coubert (which I grow), all the rugosas they have are too large. I don't think I've seen Therese there.

predfern: I was actually considering Carefree Beauty. It seems very hardy and disease resistant.

onederw: Yeah, I was worried about Gertie's height. Of the Austins, I was thinking of The Prince actually. I grew it in the past and it's height, color and fragrance were amazing. I was also drooling over William Shakespeare 2000 although I have never grown it. Unfortunately, Austins here tend to die back quite a bit :-( Lavaglut does sound appealing though.

I think I've seen Carefree Beauty recommended as a good hedge rose in several different rose books.

Another possibility might be hardy John Franklin; it looks like a natural for a hedge.

Best wishes,
Mary

Here is a link that might be useful: Picture of John Franklin