Fwiw, using the custom python unwinder in https://gitlab.winehq.org/rbernon/wine/-/commit/d14edd5abc0791692660acb8ac8c... and this Gdb change https://gitlab.winehq.org/rbernon/binutils-gdb/-/commit/7725b24533c218787e36... which I sent to the gdb-patches mailing-list, it is possible to unwind through `__wine_(syscall|unix_call)_dispatcher` as well as back from user callbacks through `KiUserCallbackDispatcher`.