Thanks for clarification on the I650 Stearns® VR™ Versatile Rescue vest. Looking at the webbing it seemed like it should be able to take a hoist especially with the Optional Auxiliary Tether System which attaches to either shoulder. The "Supports up to 1,100 lb. when properly integrated. . ." makes it seem ready for a helo hoist.
As I recall from the helo hoists I've done, all the weight was taken by that wide piece of webbing across the chest and the leg straps didn't do much. As you said, the leg straps just keep the vest from riding over your head.
Sounds like you are thinking about the "horse collar" type lifting strap. Having transited to and from more rotary wing aircraft than I can remember via a hoist/rappel/fast rope, I strongly suggest a proper harness. Failing the use of a harness then a properly tied "Swiss Seat". If you are looking for an all in one solution for PFD/Hoist they are mostly green in color and not 100% comfortable until you adjust to it.
Mustang makes just one example. The hoist straps don't show in the picture, but they are there.
Good luck.
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