John,
The N8VEM side of the house did a DSKY several years ago; I have one on one of my early N8VEM Z-80 builds; IMO it turned out really well. It used commonly stocked parts. If you decide to add an option for a DSKY type interface it might be a good starting point.
http://n8vem-sbc.pbworks.com/f/DSKY+for+the+N8VEM+sbc.pdf