Ah, it took me a moment to understand what you're getting at. As i envision it, if the seizing where to fail, the line would run through the attachment and fetch up at the end of one leg or the other; you'd be at the end of a single 9' length. A properly applied seizing ought to work, but if one of the eysplices ends/clips were to be lost for any reason, you may well be relying on the seizing for your life. See Brion's warning re: inner/outer bobstays seized in such a fashion in the Apprentice.
i can understand trusting your splicing over your sewing, but why trust your life to either? It sounds like a case of thrift (which i would otherwise heartily support), but quality commercial safety tethers are pretty cheap peace of mind at any cost.
One home-brew solution i've often trusted are common rock-climbing daisychains. These are continuous loops of flat sewn webbing, sewn together every 3 inches or so, making a long chain of little loops. They come in various lengths. For work aloft, i have two, about 2' and 4', cow-hitched to my harness, with burly locking carabiners cow-hitched onto the ends. All the loops make it easy to adjust the tethers to any required length. i've spent many many hours up both rock walls and masts hanging from such tethers and completely trust them. They're cheap enough and available enough (at climbing shops) to simply discard and replace at the first sign of wear.
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