You'll get new growth at each leaf axil even if you don't do any cutting. I'm not sure why you want a new leader?
Are you trying to grow the plant as a bush rather than an indeterminate vine? Cutting the tip out of the main stem will delay flowering and fruiting, is that what you are trying to do?
The main stem will have flowers and fruit before any new growth that you get from the leaf axils will. In fact, some folks call the growth from the leaf axils "suckers" and cut those out, although I personally don't bother because they too will have flowers and fruit.
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