The Marsupial will work. Cant say if the SG will or not.
Outside the box, but the Kifaru release pouch will also work (uses a molle system unlike the 3 bar sliders on the other kifaru bottle pockets). I used it on the belt of my minikeg for day scouting as a bottle pocket this year and ended up switching out the gen 1 bottle pocket that I had on my Bedlam when I packed in. The felt lining on the inside make the bottle easy to get in and out and completely silent. It’s about the same size as the marsupial and old kifaru gen 1 bottle pocket height wise. You can adjust the tension on the bottle as well. I actually prefer it now as my go to bottle pocket. Flip side, it doesnt have a retention strap like the gen 1 bottle pocket or the marsupial......but I never used that on either anyway.
Left is Kifaru release pouch, right is the back of the marsupial.