By my calculation, your requirement of using a page size of 2 * A3 width translates to 11.69 * 2 = 23.38". This exceeds the Word limit of 22" https://support.microsoft.com/en-us/kb/95109
Regarding QlikView NPrinting entity reports, yes, you can only use one QlikView object but that object can be an entire sheet. So if you have a sheet that only has your 2 objects on it, that sheet can be used in an entity report. Keep in mind that you cannot use a hidden sheet if the sheet itself is the object (as opposed to using an object on a hidden sheet which you can use).
HTH - Daniel.