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I said "if it has to ba a straight ", because there are "safety" razors, which are also called single-edge razors: they must be honed and stropped too, like a regular straight, but fit in a head...

Not a lady here but FWIW:

If it has to be a straight - I'd say at least shoot for a shorter blade - about 2.5" or less cutting edge. (Standard is about 3"). It seems this would be easier to handle...