pot value doesn’t matter; pot taper absolutely does - namely, you need it to be linear.
Regarding stock: that’s unfortunate. This is, however, where it might be worth in one of the groupbuy threads investigating purchasing a larger quantity of faders. The ‘case’ the factory will ship has 900 in - this is what Mouser break apart to sell individual ones. The lead time is 12 weeks. But they come out sub-dollar-a-fader - about 85c. Excluding shipping and so forth. The three month lead time is because they are basically making them, or adding them to a new order.
Mouser should be able to order things in volume that are out of stock; they need to be encouraged to make an order. The product isn’t end-of-lifed or anything. But if they had 300-ish in stock, that’s literally less than 20 16ns.