Freehubs aren't interchangeable between brands. Replacing the hub requires a new hub (high end hubs range from about $120-$600), and will probably require new spokes. Basically you're only saving on the rim, which isn't even the most expensive component, and it's over an hour of skilled labor. A prebuilt wheel is in fact probably the most economical solution. I think part of your cold response is that a lot of people would find your fixation on the noise of your hub a little silly and showoffish.
I'd recommend you first have a shop look at your hubs to see if they have a serviceable freehub mechanism. If so, they might be able to make it a little louder by changing the type and quantity of lubricant, although straying far from the intended lubricant can cause problems.