Don't 'sand' blast them, they will look rough and pitted afterwards and will be difficult to get nice and shiny. bead blasting is better...However, those ones you have look as they do by design ( my design), they have been partially stripped to take them back to bare metal (mostly) on the areas that were meant to be silver, then a liberal coating of lacquer to prevent rusting. ( its a thing I do, not to everyones taste )
Anyway, to get nice shiny
smooth metal to get a great paint finish you should get a selection of medium to fine wire wheels for your drill, in various configurations ( cup, twist, flat disc, etc ) and strip the paint and any rust using those. they are not aggressive enough to cut into the metal, and will semi-polish as they go. you could also use a paint stripper first, to get the lions share off, then go in with the wire wheels/brushes, and finish off those hard to reach areas ( the rim/centre piece join ) with a wire brush/flexible blade ( whatever comes to hand ) to get all the debris off. The metal on those wheels is predominantly good and smooth, it will take a bit of time, but will be worth it. Use an air line with a blow gun attachment to get rid of all the dust etc, wipe over with thinners and blow them again, then spray prime immediately to prevent rusting.
The spare in the boot has not been touched by me, that's what all the wheels looked like when I got her, about 15 layers of silver paint on each one