Hi Georg, I don't know if I understood correctly your requests, as I had mentioned via email, the updated AROS systems you can't access them with the Rom "integrated" in WinUAE, you have to use the latest Roms and you can find them in the ISO of the Nightly Build
HERE in the Boot/Amiga directory.
Winuae uses a unified ROM of 1MB, in the Nightly Build there are 2 Rom of 512KB "aros-rom.bin" and "aros-ext.bin", if you want you can also merge them and create a single ROM of 1MB, these 2 Roms must be set on WinUAE, I attach my WinUAE config where you can see the right setting.
Currently there are 3 distributions of AROS 68k each one follows its own line, for example ApolloOS to boot from WinUAE you have to modify the startu-sequence, moreover ApolloOS is distributed on an image with more partitions, the first one is in FA32, this distro is dedicated to Vampire V4 and you can't boot it from WinUAE, you can do it only if you extract the AROS partition.
Moreover ApollOS includes OS3 libraries and files, if you want to get acquainted with AROS x86 it's better to start from the Nightly Build of AROS 68k
Some days ago I was testing some software on my AROS One 68k Distribution
THIS , AROS 68k got infected with the "Hitch-Hiker Virus", then I used both Virus Checker to clean up the whole system, also tried VirusZ not very compatible with AROS One 68k.
I attach Config WinUAE AROS 68k: