My advice is have it professionally done if you don't want to wait for new rims.
The challenge with wheel touch up -
There is no off-the-shelf paint for the Hypersilver color. I believe it will always need to be custom mixed. The challenge is that it has a black undercoating and is hard to match the right color silver on top.
Your average touch up paint will leave some paint blobs.
See my example - I almost got the tone right but would have been better off with an airbrush or rattle cans.
Wheel is perfect now that I had it professionally redone.