I F you use the Brian approach consider an AND function with a led. That way you can turn the function on and off when needed. It keeps the brain from pulsing the output all the time.
Hood, Good call on using a brain to reroute the signal.
I would NOT wire anything direct to the LPT port I would run a GOOD BOB in between to isolate signals . IF you mistaking input 24v into your PC/BOB it could toast it .
Just a thought, (;-) TP