I do note that while playing with the sources of Basilisk II, there are ROM patches to make the Mac ROM work on a 68060 CPU. Why? Basilisk II has a native execution mode where it passes the 68k instructions through to the host 68k CPU when it's running on a 68k Unix/Linux platform. Said host can be a 68060, so it patches the ROM to make things behave.
d) 68060 systems are a small problem because there is no Mac that everused the 68060 and MacOS doesn't know about this processor. Basilisk II
reports the 68060 as being a 68040 to the MacOS and patches some places
where MacOS makes use of certain 68040-specific features such as the
FPU state frame layout or the PTEST instruction. Also, Basilisk II
requires that all of the Motorola support software for the 68060 to
emulate missing FPU and integer instructions and addressing modes is
provided by the host operating system (this also applies to the 68040).
So it's not impossible in software. However, in hardware, good luck
