Are the rims hub concentric or lug nut concentric???
Do you have any close sized hole saws? Put one the current size of the opening inside one the size you want. Or bolt a piece of wood through the lug bolt holes. Mark center and use the correct size hole saw. Clean up your edges and paint.
No as fancy as doing it in your mill or a lathe, very common for car and truck guys to do it either way.
As you know, Dodge, Jeep and Ford used the 5x5 1/2 bolt pattern for years. Ford had some 16" rims on broncos. Dodge even uses that bolt pattern on 17" rims on their half tons during the late 2010s. Can't tell you exactly the years from memory. They do give it a metric number. Off roaders like the 17" option due to tire options.