The 68k version would be patched so that intuition/graphics/dos library calls would be passed through to the x86 AROS...
This involves endianess problems in a way it is not possible map functions like OpenWindow() to the x86 AROS... making rendering calls to gfx lib is impossible because struct RastPort is not blackboxed and could have bigebdian pointers like the font, bitmap, layers, tmpras...
It is (of course) possible replace kickstart rom code in UAE by native x86 code but possibilities to co-operate with the host OS are very limited... share filesystem, share settings, maybe even let 68k programs have appicons on Wanderer but I think that is it.