I want to layout multiple images to be printed to an A4 sheet.
But I'm actually printing on a roll.

So I want to see an A4 area to get my layout, but then print 1 or more A4 pages to a roll, say 24"
Crop marks required to help trim the A4 pages after printing.

As the printer driver determines the page size, if I set to a roll, I don't have any guides for the A4 area.
If I set the printer driver to A4, then I can't layout to print across the roll.

What's the recommended method to do this?

Thanks