You cannot have the page number in the header, since page numbers have no meaning in an ePUB. After all, the page changes when the font-size changes or when the screen size is different. Since ePUB's origins are also found in the Daisy format, you might expect that this is possible. In fact, there is some code (oeb-header IIRC), but that is not supported by any reader I know.
It is possible to create references to the original page number, but as far as I know they are not visible. They are just references. You can point to them in a kind of index way.
There is something like fixed-layout, but that is heavily dependent on the reading device. You have to built it for that specific device.
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