Sometimes (many times) is like os4 is against the real amiga.
they want to sell their licenses and avoid everything that would support users on other platforms. I can remember reading a thread where someone asked one of the Friedens to compile something for another platform (I think it was Warp3D for 68k) and the answer was I could but I do not, buy AmigaOS when you want to use it (i do not remember the exact phrases). That shows the attitude...
As Wawa said only chance is AROS 68k. BTW the same is partly the case on MorphOS team too. Both "closed-source" and "commercial" camps want to defend their advantages and are not interested in sharing code in areas where they think they are better than the others. It is their right of course but it would have been better in a common interest to work together. But that is not the case (and will propably never be).
Of course it is different outside the "core" and even in the teams there are exceptions that are very open (like Fab from MorphOS-Team) but I think every technology that is seen as advantage like MUI4, P96, Cybergraphics 5 and so that is copyrighted will not opened or at least cross-compiled.