Been working on the same issue, my A4000 has the IDE > CF adapter and its awesome. Want the same for the A2000.
Seems the SCSI>IDE adapters are pretty pricey, trying to find a Buddha Flash IDE adapter that fits in your Zorro II slot and will then attach the IDE to CF adapter.
Buddha Flash is no longer made and having no luck finding the Flash version myself, but keeping my eye peeled.