Ok though this isn't a good Technic, and really shouldn't never be done with any thing heavy ever. I went into the laboratory and set up a scale model of my semi-pulley-less false crotch. Knowledge is power and you can teach it to people you don't like. Leave or find a small stub. run the line around the trunk,make sure rope going to catch on that little bit of stub,
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also be sure rope is running under the working line
View attachment 358944see how it is caught on that little stub, and how it goes under the other line. The weight of the chunk will hold it in place, so long as it falls just right. You could conceivably use a 5/8 rope on a stub that size on a really big tree. Like I said good to know, bad to do. I've only done it with 3 strand rope and haven't done it for many years. But I've done it working by my self. you can control the branch from up in the tree letting it run, I would do one , pull up the other end and use it. then climb down and untie them. Some times you got to do what you got to do.
I have nice shiny pulleys now. their sweet with a cow hitch. We all know leaving stubs will always bit you in the ass at some point, on a removal also.