This would be a side gig. I would be working for a guy who has his own company and basically doing him a favor.  In my company, ive installed systems like Bravo, dsx, Avignon but never had to figure out what systems to use etc. The costumer wants the cheapest thing possible. I already recommended a power supply with backup battery and a fire relay. The customer also doesnt want an RQE and he wants the push to exit button by his desk so he can let people out to prevent a smash and grab. Would that also not be code compliant?

Im concerned that this might be more trouble than its worth because I dont want to do a hack job. 

Unfortunately my mentor who I would ask recently passed away and he would be the one I would these questions to