You sure do have some interesting projects. Believe it or not, the 224 Weatherby has a .430 rim size, at a 1.93 case length. Of course, its belted, but you can't have everything. This case will generate 2000, 2200 or 2400 FPE with .264, .284, or .308 bullets, respectively.Not a lot different from rounds based on the 22-250 or 300 Savage.
If you push the shoulder back 0.30 inches and trim to 1.62 inches, you can still get 1700, 1900 and 2100 FPE, respectively.
Also, the 6.5X54 and 6.5 Carcano are close with a rim size of about .450.
Of course, there are many .473 rims that can be milled down to .440. Once you are set up, this milling is really no more complex than trimming - I am surprised it is not done by wildcatters more often, especially going from .473 to .440. A 0.33 reduction in rim will generally not affect feeding. The straight stack CZ magazine should not be that difficult to widen.