Same Link Wheel Infrastucture for Different KW?

I'm new to the whole linkwheel thing and built a couple last week. I wanted to ask, though, about what you do when you want to work a different keyword from the one you were promoting with the first one.

I'm going on the assumption that a single link wheel (say, of 6 WEB2.0 sites) will promote a single KW phrase typically. Please correct me if this is incorrect thinking.

I obviously have profiles at these 6 web 2.0 sites, and I used one post per site to put a bit of content and the all-important 2 links (1 to a post on my main site (or to the main domain url), and 1 to a post in one of the other web 2.0 sites). Again, please correct me if this is incorrect.

My main question is: now that I have built a link wheel around one keyword/page on my site, what do I do when I want to promote a different keyword? Can I just put new posts on each of the same web2.0 sites in the original link wheel? Or do I try to use a different mix of web 2.0 sites this time around?

I hope this all makes sense:p

Thanks!

Ken