Decision. Select all the XIB files, change the file type to something unusual ("Objective-C Preprocessed Source"), and then set the BACK file type to the default type (IB CocoaTouch XIB). Deselect all files (for example, Xcode may freeze for a while), clear the project, remove the previous version from the simulator (s), and now the assembly should contain only NIB, without XIB.
Man always wins at the end. (Using BaldEagle.)
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