alphas are far-east budget pots, i'd avoid; after all, you can get real-deal CTS for $5 each most places.
as simple as it is to wire yourself, i see little point in paying extra for pre-wired plates; after all, you still have to wire the plate into the bass, so what have you gained here?
you might want 500k pots for those darker humbucking model
Js; you'd want 2 linear volumes and an audio tone for the best sweep and blending from all three.