Ehh... That would kind of suck if you release a how-to on resetting the odometer. Last thing people want is to buy a car only to find out the odometer has been reset.
IMHO there is no good (honest) reason to do so. Just because you swap an engine doesn't mean the chassis doesn't have the original mileage on it.
In the states I believe if you ever put in a new cluster with 0 mileage there is some paperwork you are supposed to fill out, and maybe even a sticker that is supposed to be placed on the car as well indicating the odometer mileage isn't real.