Why stick at just ZIII DMA, let's make the impossible and make it ZIII DMA with burst mode.
Just kidding...

@mboehmer_e3b
"So all Zorro II machines are out, all A4000T machines, all A4000 machines with Buster 9 and one DMA Zorro III card, and all A4000x with Buster 11."
Wasn't it you that said it was only Buster11 mahchines with already a ZIII DMA card that were ruled out ?
The 4000T's internal SCSI controler can be disabled...