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If you were to red line it; it would only be a strain on the bearings, and just for a few seconds, so I see no danger in "gearing" it low.
You can also get much more power out of it if it's running 7.5k rpm's.
so if you wanted to set it up at 7.5k = 4k, that would be a ratio of about 1 : .53
and for a 5.25 pulley you would need something around a 2.75" pulley. I don't know if it would be wise to go any smaller, as the surface of the pulley that transfers the power should not be too small, plus you should always have some room for miscalculations, driving too hard now and then, and other f--- ups that are bound to happen.
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