This may be an old idea - or it could be a really cool new idea!
I kept looking at my tech line & amsteel tarp lines that had a loop on one end with a nacrabiner to connect around the tree.
I kept the loop but added a figure 8 loop just up from the bury, I pulled the Fig8 really tight so it made a hard knot.
Basically it is a poor man's nacrabiner when you put the loop over the knot and pull tight. Has not failed me yet and I use a figure 9 on the other end and pull extremely tight.
25 feet of tech line plus small figure9 is 7 grams.
See below for pics...any comments???