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I have a range of minis that I have undercoated in Skull White Citadel spray paint.  I have had a decision change on the final colour scheme that I want and would prefer to undercoat in Citadel Chaos Black but I think that would make an undercoat that would be too think overall.  Does anyone have any suggestions or advice please?

Is there any particular reason you need to reprime them?

Can you not just paint the scheme over the white?

Paint them black, no need to spray them again.

Paint them black or strip the white primer before priming black.

Painting dark reds and dark greys over a white undercoat isn't as effective as they would be if going over black undercoat. But that's just my opinion. Basecoating black is an option but a time consuming one and I'd only go there if there was no other option.

Just look at the models and try to gauge the current paint's thickness, especially relative to details with shallow relief. Have inside corners softened? Any panel lines or subtle texture already nearly lost? If you're applying your sprays thinly and evenly, a second or third coat shouldn't be a problem - some painters do a bi- or tri-tone pre-shading with spray paints (meaning even 3-4 layers is doable) as a matter of course. Black enamel sprays, especially, seem to go on thin, which works in your favor.

Stripping is certainly an option, but it may not be necessary. Spray a test model black if you're unsure - that should tell you quite clearly whether stripping or hand painting is needed over a quick re-spray.

If you're worried about re-spraying and don't want to strip, you could even buy (Vallejo have big bottles) or mix up (higher cost, up front, but the supplies are generally useful and will last quite a while) a large quantity of a heavy black wash. It would darken the undercoat considerably, give you a leg up on highlighting/shading, and would be quick to apply. Yes, it still means brushing by hand, but you just slap it on liberally with a big brush - none of the worries about smoothness and coverage that come with basecoating. Five seconds per model, assembly line style, isn't much of an investment of time or effort, even with a large army.