They DO make morph dials to customize characters with, just sayin... no need to export and re-import a character, hoping that the texture maps don't get fucked with in the process.
Genesis 8 comes with a few, plus there are the Zev0, Sickleyield, and other morph addons that give you a LOT more options when it comes to customizing a character. I'm thinking specifically of the free Sickleyield morphs on ShareCG.
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There is even a morph randomizer which can create entirely new characters for you. Just spin the setup dials and run the randomizer a few times until you end up with a particularly pleasing shape.
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Also this one, but you'll need the relevant morph packs:
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You can also swap out skin maps to a degree on Genesis 8 using skin maps from other characters, which can significantly change the appearance of a character. Between these two options, yeah you ALREADY have the tools needed to create your own character.
There are also a number of free characters and character shapes on Renderosity, ShareCG, and a couple of other places, which increases your options.
I generally don't sweat using 'prebuilt' characters though. Daz sells them that way for a reason, and other game designers do NOT have an exclusive license on those characters. Characters that they (the game designers) dial in themselves using various methods are another story of course, but at that point they aren't 'just' pre-built characters available in the Daz store.
In short, you can do a LOT with the morph shaping dials. Look into them.