I was doing to make one. It's basically the same exact function of the slide hammer I used. You can't get much of a swing but they would work pretty well in most cases.
That only helps once the axle is out if Its seized. I tried pretty hard with the axle in to pull the hub out. Never gonna happen.
My calculations predict impacts of 12-15,000# with 3-4# hammer which is far more than needed to move a hub out of a bearing
You never want to use impact to press a bearing. Impact kills bearings in fact BMW has a TSB to preemptive replace a wheel bearing on any wheel that was impacted in a crash. (that by the way is how most wheel bearing failure happens. Pothole in a curve). If the seal doesn't fail, a wheel bearing can last a million miles .
I've never seen a bearing you could drive on that looked this bad. This was the bearing I replaced related to the axle that was fused.