Of all weird things, I just happened to stumble across this:
http://www.systemyde.com/proc_tab.html
specifically:
http://www.systemyde.com/pdf/y8002.pdf
Someone has reimplemented the Z8002 in Verilog HDL, and I'd guess run
it in an FPGA.
Which rather suggests there is a market for it as an embedable macro-block
in some devices, which the existing sources of Z16C01/Z16C02 are unable
to satisfy.
DF