According to these tables (for reversed lenses):
You can get 5:1 if you add 160mm extension tube to a 35mm lens reversed, or 130mm to a 28mm lens reversed.
Note that whatever you're photographing will be very close to the rear of the lens (now in front). For example, if you add 130mm extension tube to a 28mm lens, the distance from the object to the sensor plane has to be 227mm. Let's say the lens is about 30mm long. From the rear of the lens to the object will be about 60mm, about 2.5 inches.
With the exposure factor about 30X, you definitely need a flash.
Another way is to use a reverse adapter. I don't know the formula. But I think a 135mm + a reversed 28mm will give you the magnification in the ball park.