Thanks for the pointers, after working through things again properly in MB I got this working with little trouble.
It’s using the original Genesis model, I started off with Genesis 3 but the older Genesis ended up being much easier to work with for a few reasons. If you know of anything it’s likely to throw up problems with further down the line then it’d be much appreciated!
The main reason for using Genesis was that Mixamo wouldn’t accept the Genesis 3 skeleton. What I’m working on will need interchangeable clothing meshes all rigged the same as Daz does for you, and trying to get them all set up with Mixamo’s generated autorig consistently enough was proving pretty much impossible. With everything else involved with getting a prototype up and running to see if there’s a worthwhile game in it, I won’t likely have the time to start learning enough about rigging to deal with this kind of thing properly any time soon, as much as it pains me to be relying so much on automated tools. Genesis also having all clothing work with both male and female models was a big bonus, while there are tools to transfer between them on Genesis 3 it was yet another process to learn then another step in the workflow that I can really do without because of the time involved.