Shorter/shallower dust caps?

That’s a pretty standard dust cap. You won’t get the distance you need out of the dust cap, there’s no where near that much space between the dust cap and the spindle nut.

The issue is the distance the hub protrudes through the wheel. You’ll need to get a deeper push through wheel cap to make that work. Or a wheel spacer. But you should be able to find a taller wheel cap, just look up the wheel center diameter and do a search on Summit.

I had to do something similar with my Enkei RPF’s, I had to machine the wheel centers to clear the hub and then find a set of wheel caps to fit the new larger center register.