I would try to save the plants since you haven't transplanted them yet.
Since the plants haven't been set out yet you could try submerging them in water or a slightly soapy water for a few minutes and then repeat in a few days. I have never done this for mites but have for aphids and it worked well. I don't know how long it would take to kill mites but they do not like too much water and that would definitely be too much.
If your temps are below 90 degrees then you can use the sulfur dust but you must get it on all the surfaces particularly the underside of the leaves. I know it works because I have used it; but I rarely have mites before the temps get above 90 down here.
I have never tried the alcohol spray but it sounds very promising.
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