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A pin wash (very flow-y wash applied to recesses after a gloss coat - easy to find tips with a quick search) shouldn't require much cleanup, if any (just wipe/soak up the excess while wet), and can be done with acrylics, oils, or enamels. An oil wash would still require cleanup if applied generally, instead of as a pin wash, but it would be a very fast process - just swipe over the model with a cotton bud dampened with your thinner.
Both methods require a layer of varnish to be sprayed over the basecoat (oil washes require another to seal them before you resume with acrylic painting), but neither requires repainting to cover mistakes, which is the real painstaking part. If you paint in batches, the preparatory sealing is a small price to pay for the decreased labor and barely affects turnaround time, as you can work on one batch as the next dries.
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