Problem with REPLACING a bolt- bolts are NOT drop-in parts. If replaced they need to be checked for correct headspace, and adjustments made to the rifle if needed. Failure to do so can result in serious injury and your name being taken in vain by the shooter on the next station over. Changing the bolt HANDLE does not affect headspace.
The simple thing to do is take the rifle to a gunsmith (not a parts swapper, a gunSMITH) and pay him the few paltry dollars to do this. Involves cutting the bolt handle, using appropriate heat sink paste to limit heat travel while welding, doing the welding, and smoothing the weld. Unless you are planning to do a LOT of M-N bolts, t'ain't worth the time, money and bother- as well as possibly killing a rifle.
What we have heah is.... failure to communicate.