Is there anything wrong with just '-'? you may have to escape it '\-', but that is easy enough, isn't it?
One sed feature does use 3-digit octal for non-printable characters '\055' for your example - maybe that will work. The shortcut for hex is often (C-style) \0x2d - does that work? Of course, for readability's sake, use '\-' if it works!!!
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