I think the only way to achieve this is have a suit printed out a bit larger than your initial size and cut the suit in half. That's what I thought about doing for my ASM2 suit, but have been researching and thinking the pros and cons out, so i stick with the u zipper. Although I have seen someone cut the ASM2 zentai zone suit (not zentai zentai) and use a normal zipper But even then I'm not entirely sure it'd work. But having the extra sizes to your print you can cut it and have seam allowance, but it could be constricting and won't be able to have a full stretch when posing.
since you already have a suit and want to cut it in half and at the boots, you could be condemned to having a suit that has no stretch for you to get to the floor and pose and have the risk of popping the stitching from over stretching the seams.
here are the photos from his Instagram. He posted updates everyday about what he did with the suit.
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In this photo he has a zipper running down the red belt and one running down his tucas. I asked about the restrictions within his suit and he says it's fine. Although, he has a removable mask, I think if done with a one piece it wouldn't work. But he is able to pose and contort his body without restrictions. He cut the zipper out from the shoulders on the back and did cut it from the waist. Though he doesn't use invisible zippers.