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68000+6888x is only supported if no CE and more compatible. Hardware level 68000+6888x does not exists in real world (see below). Emulating it would require FPU emulation that uses 68000 prefetch pipeline which is not worth the trouble. (This combination has never been supported, or at least it has never been fully compatible)
This is not same as real 68000 + 68881 combination. Because 68000 does not have hardware co-op interface, extra software is needed (math libraries or similar comes with the board) that decodes FPU instruction, converts them to coprocessor interface commands, waits for response and decodes the response.
Basically it emulates 68020/030 co-pro hardware interface in software. It is most likely horribly slow.
EDIT: emulating co-pro interface in UAE is not going to happen. It is ultra-extremely-complex and not very well documented.
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