The point if using crust leather is that they will develop fast patina from loss spray paints and antiquing creams. Which means it would be very hard to maintain the existing color unless you find the right blends/mixes of creams.
That being said, renovator takes off more pigments than Lexol from my experience. So I would (and I do) uses light colored creams (light brown) with renovator.
All new shoes need is just waxing the welt threads or at most wax the whole shoes and scuff the soles.
Or just follow Rons advise above. He's an expert.