If you're serious about this question........taken as you wrote it....the
only way I see is to make a large border area around the 8.5 x 7 field that
will give you your 5 inch margins, and output it to print on a Plotter
which will handle the larger size paper needed, then trim with sissors to
the size you want..........
Vaya con Dios,
Chuck, CABGx3