Conceptually (even!), I don't see how you get out of
what I see as essential to the structure --i.e., that with
two anchor points one necessarily creates what you fear:
a triangle formed by the raft-between-points, and whatever
ties to them !?!?
If you give up one, then you have a non-loop structure.
But once you've tied to a 2nd, . . . <above> .
there is no reason not to put some thinking into an improved knot.
And this doesn't have a *knot* as a solution..
E.g., trying to reduce the loop size to minimal,
and thus snagging risk ... ,
one has a straight line between the anchor points
(which is the eye of an eyeknot or whatever),
and THAT puts unkind aggravated loading on
the rings --in force and angle.
PERHAPS one could create a structure that entailed
some solid (counting mesh/fine-netting as "solid")
material to fill the loop's "triangle" so to preclude
penetration ... !? This will require some skill in
materials selection and stitching (presumably).
Or maybe a preliminary question is needed ::
what's the purpose of this line?
If it's largely something about handling the raft
away from in-the-water operations, then one might
go with some one-anchor attachment that can
become two-anchor when needed --e.g. an eyeknot
with long tail adequate to
(a) bind eye together with a strangle knot for operation
then
(b) untie for making a reach and 2nd-anchor-tie as needed?!
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