With cxoffice pro 5.0.3 and Emu48 1.42, the app installs and runs with an HP-48G ROM and all the default skins except "floating buttons." (That one's buttons work, but the display doesn't show anything. I don't know it it behaves the same on Windows or not.
I may get a chance to do more testing later. If so, I'll post results here. Thanks to all WINE developers, Christoph G. and CodeWeavers. If any of you didn't do anything specific to get this app going, you still deserve my thanks for your wonderful software! 8)