The problem is not being able to see it on iPad, but layout for the book. I want to be able to see the layout and font correctly as I am designing the book, not just the preview on iPad.
I think that's unrealistic, sorry. As with apps, it is critical to test the final product in the same way the user will experience it...on a device.
I know that means owning one, but it is important to do, so if you don't have a device, do your best to find someone that does and ask them to help test for you.
new book just released:
An iBuild Opportunity (Part 5 using fonts & more) on the iTunes Bookstore solves many font issues
check it out
p.s. generally, what you see in preview from iA on an iPad is what you get when published (some issues but not many).