If it's a rear, shaft drive hub, the thing is going to be 8", maybe 10" in diameter.... i.e. not a nice svelte front hub. At www.speedymetals.com
, a 10" diameter, 7" long hunk of aluminum costs $326 plus shipping. And most of it is going into recycling.
And, there are the drive splines to consider... that's time on a wire EDM, or possibly a custom broach, or if you can find someone who still has one with a really big work envelope, a shaper. Two are expensive and one is uncommon.
My original suggestion might sound like a lot of work, but it's actually massively easier to drill the holes in the new flanges while they are flat on the table than trying to drill spoke holes in a one-piece hub.