Just the day before yesterday I was browsing these items in our local Walmart, being amazed by how inexpensive they were. I bought a spare post cleaner - you know, the wire brush affair-- after being somewhere without one. A new set of replacement terminals - less than $2. The most expensive of their battery cables - less than $8. I was looking more at the red ones, but I believe both came with dual wires-- a 2 or 4 gauge for the starter and a shorter 10 or 8 gauge wire for the distribution. Not sure, but I think the negative wires had dual connections too. The heavy one to the block, and the smaller one to the sheet metal screw on the inner fender.

Only thing I can think of you might run into later, is one of the two connections will fail, and you'll be chasing a problem like a burned up engine to firewall jumper. But there's no difference I can think of between that risk and the risk of a factory cable getting a bad connection at the block or body ground point. And your battery has to be held well in place now, like belt and suspenders.
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Art Benstein near Baltimore