From online search there does not appear to be a way to force ibooks to show one page in an ipad in landscape mode without moving to a fixed layout format like pdf.
Generally, overriding a users choice for fonts, sizes, colours, orientation, justification, etc is not a "good idea". Especially for general Accessibility concerns. I do not recommend it.
That said, if it is just the title page or first text page, have you thought about treating it like a book cover and using svg to fill the screen?
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