I wish you luck sir. My only thought is if I had to rely on it the rest of my life a LEV is the last elevator I'd want. Your right, the electronics are the weak point. I always said if I had to have a home elevator in my house I'd build my own relay logic controller from scratch. But I'd prefer to buy a single level home. Longevity wise your in a tough spot. Because the hands down best and most reliable home elevators ever made were the relay logic inclinators. But even they have caved to their larger dealers with untrained mechanics unable to wire and so they ditched relay logic in favor of microprocessor controlled serial communication controls. In other words, I'd tell you your best bet is to mod it, but there's really not any really great options to mod it to. Better than a LEV as far as reliability? sure.
Great? No.

Honestly you sound like your definitely not a 25 watt bulb and you understand what your doing, but I hope you do understand everyone's reluctance to give out technical information to someone who has stated they are not a elevator mechanic due to the potential liability.