From Ace Custom .45's site, the factory loaded .45 super (Texas Ammunition Company, Buffalo Bore) runs at 28,000 cup. (Other sources list it as 32,000 to 36,000 CUP). Standard .45 ACP runs around 23,000. .45 +p runs at about 26,000. By comparison, .38 Super runs at 35,000-36,000 cup. Full power 10mm (Double Tap, Original Norma, etc.) is in the same pressure category as .38 super. In other words, in terms of pressure, the .45 super achieves stellar performance without the higher pressures (much of the source of beating a handgun) of the 10mm (don't get me wrong - I'm a huge 10mm fan).
The .45 super can handle the pressure because the case is different: the dimensions are the same, but the case is strenghtened to provide far better support (this is all from Ace Custom's site). A .45 super case looks like a .45 ACP case from the outside, but it is a far stronger "beastie" on the inside.
Ace Custom's .45 Super conversions involve mostly re-springing the pistol (recoil springs and firing pin springs) and the magazine. A barrel swap is not necessary! Because of that stronger case, an unsupported/unramped 1911 barrel does just fine. With .45 Super ammunition.
Now, an EAA Witness seems to work well with 10mm - from the downloaded FBI stuff all the way up to Double Tap. I see no reason why a stronger, tighter, more massive CZ-97b - that has been properly sprung and made reliable - could not handle a .45 super. It is not a "monster round." It is not as brutal on a handgun at full factory power as a full power 10mm.