I assume that was a typo, 68450 is a dma controller.

I don't know of any 010 systems that used a 451, maybe one of the Moto VME 010 boards?.
There are a bunch of examples of Unisoft 68K ports that use 000 and 451 and handle non-recoverable instructions by trying really hard for them never to happen
I assume the Wicat with a 000 does this as well.

010 systems with variations on ram segment/page MMUs were pretty common and have common ancestors with the SUN cpu board


and there is an existing 7300 emulator here
https://www.philpem.me.uk/code/3b1emu