Even the Mountaineer GT-2531 sounds like over-kill to me. It has a load limit of 26 pounds! That is more of a LF tripod.
I am not familiar with the new numbering system, but something along the lines of the old Reporter series is plenty! I have a friend that got along fine with one for her Hassy. Something more along the lines of the:
or better yet, the lighter:
Also, if you are using a waist level finder, one does not need much height compared to an eye-level finder. So the lighter pod will not to have its legs extended all the way for the Blad (thus more steady), but can be for the lighter 35mm camera.
PS...just realized that I own a Reporter (old 200 series), and use it for my Rolleiflex all the time...and it is more pod than I need for it. I also use it for my light 4x5 (2.5 pound, with lens, Gowland). The next size up, the Studex (old 300 series) is over-kill and I had one I used for the 5x7 -- steady!