I don't think of the Chinese Button Knot as having a loop, at least not when I've tied it per Ashley Book of Knots (ABoK) #599.
May I suggest ABoK #787 the Sailor's Knife Lanyard Knot?
Note the two top-left drawings in the 787 picture are for ABoK #786.
The Sailor's Knife Lanyard knot is almost identical to the Chinese Button Knot, but has that loop I think you'd need.
If you're just looking for a big knot, I'm also a fan of ABoK #1142, the Jar Sling Knot, whichis designed to go around a bottle, but makes a pretty big ball itself. Tying it per Ashley is sort of like a magic trick and I've always found it very satisfying with it comes together correctly. (I'm told there's a easier way to tie online somewhere, but I think that would take some of the fun out of it for me at this point.)
Knots in modern high-tech stuff can creep a bit, so I'd mark the tails where they came out of the knot and check for creep after each of the first several heavy loads.
The San Francisco Public Library has a copy of the Ashley Book of Knots.
https://sflib1.sfpl.org/search~S1?/...shley+Book+of+Knots&searchscope=1&SORT=D&1,1,
It's the kind of book that has
* Chapter 3: Knob Knots, Single-Strand Stopper or Terminal Knots, page 83
* Chapter 4: Knob Knots, Single-Strand Lanyard Knots, page 93
* Chapter 5: Knob Knots, Single-Strand Button Knots, page 101
* Chapter 6: Knob Knots, Multi-Strand Stopper or Terminal Knots, page 115
* Chapter 7: Knob Knots, Multi-Strand Lanyard Knots, page 129
* Chapter 8:Knob Knots, Two-Strand Lanyard Knots, page 139
* Chapter 9: Knob Knots, Multi-Strand Buttons, Tied in Hand, page 155
* Chapter 10: Knob Knots, Multi-Strand Buttons, Tied in Hand, page 165
So I'm sure that if you borrow it, you'll find several to your liking.