Today I would suggest to use only CPLD with JTAG interface.
Then no programmer was needed, simple connect the 4 JTAG pins to the LPT port.

E.g. I use the Xilinx Coolrunners XCR3032 (32 macro cells) ... XCR3512.
The are in CMOS and so very less power was needed

Also such CPLDs can be chained and so 2 or more CPLDs can be programmed over the same 4 Pins and without removing from the pcb.

In a final step the JTAG can be disabled permanently and so nobody can reprogram or steal your IP.


Peter