I recommend the python module ICE secp256k1 has no N limits, it will give you the exact results even when these results are negative or over the imposed limit. An example, the Bitcoin module, gives erroneous results when it comes to negative values or above the imposed limit. Let's remember that numbers are infinite and that a program only recognizes from 1-10, for example, does not mean that you cannot add 4+7 or that 11 does not exist.
You are making yourself a professional user, even though no one of us are.
Even if you divide, multiply, add, subtract a key million of times to get back to the targeted key, you'll not find an single answer for the new values. Because they will still be represented as 255 bits, so the complexity did not changed at all. You just moved the targeted key from A to B, with absolutely the same complexity.