It sounds and looks too complicated and time-consuming for me. I have enough trouble with my desktop programs as it is without adding my RAV4 to the loop. Our local ACE Hardware store can make duplicate keys for $35, or so they say.
'07 Blizzard Pearl RAV4 Limited; 6-cylinder, 4WD (Retired)
2012 Camry Hybrid XLE
2010 AWD Lexus RX 450h