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I have no problem in general with supporting other archs in Bochs sources tree.
And I even can set up, say, MIPS CPU engine emulation in reasonable time. But Bochs is a fuill system emulator and without system devices MIPS CPU alone isn't worth too much.
I am not an expert in the devices emulation and do not have intention to copy QEMU code into Bochs by myself ...
You could call for help in Bochs mailing list !

Stanislav