Nope. Once you cut through the stem, it will start to scar over to heal. The new growth erupts from little weaknesses in the scar. To make it grow straight, you'd have to somehow keep the entire growth ring open and active, and, well, you just aren't going to do that.
Your best bet is to just keep your chopped up mutants as 'Mother' plants in a separate tank, and keep the new straight ones in your display tank. As your mother plants gain more and more new stems as if some mythological Hydra, you'll be able to really make a lot of cuttings from them. They'll be ugly, but very very productive.
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