I've often thought of using 5x7, but cropping the negative to a 4x5 aspect ratio. (So, 5x6.25.) Effective area of 27.5 sq-in, versus about 17.25 printable area for 4x5. That's an increase in area of 60% for this expanded negative.
Indeed, a nice compromise, versus going to 8x10.
Of course, this requires a larger enlarger, etc. So if not practical, at least interesting.
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