Hi Stephen,
Thanks for your message.
I do not see any issues, in using Cubasis as a mix down capture for your two track 96 k mixes.
File exchange between the iPad and your Mac computers is easily possible via AirDrop in both directions.
To learn more about Cubasis, please have a look at the wide range of available tutorials and the additional online help:
http://www.steinberg.net/fileadmin/files/PRODUCTS/Apps/Cubasis/Cubasis_Help/Index.html
Hope that helps…
Best wishes,
Lars