there is QEMU 68k support nowadays, it wont do calling to windows stuff out of the box but its opensource and the closest to your feature request box you are going to find.
Check:
https://github.com/vivier/qemu-m68k
and
https://wiki.debian.org/M68k/sbuildQEMU
I cant tell you exactly how accurate it is yet, but ive not run into any problems with gcc compiled code (including recompiling gcc itself).
Also, its quite a bit faster then WinUAE/Aranym :-)