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peter_v
If you machined a new axle and re-machined the hub shell you might be able to modify the hub to take cartridge bearings, but I doubt there is enough metal in the hub to cut away a disc-shaped hole where there was a doughnut-shape bearing interface before.
There's nothing wrong with non-cartridge bearings, unless you hub is shagged, in which case you may as well rebuild the wheel onto a new cartridge hub or new non-cartridge hubshell (re-using your current freehub body etc).