Pendrives are unreliable, they should not be used for Archiving data, but only for exchange data between computers and doing installations.
DVDs, on the other hand, are not suitable for installing large systems, because it may happen that some data cannot be copied, they suffer a lot from redundancy, Pendrives for installations do not miss a beat.
Anyway now I tried to install AROS One v2.0, and in the menu I had to put manully the Windows string, maybe if you have time try af it too.
I need to identify for sure the latest verson of AROS where DualBoot works well, otherwise deadwood can't fix the problem.