I'm not sure about any publicly available products, but I wrote ASP.NET HttpHandler several times for .css files. This is a fairly simple task, and I usually add things like supporting variables and base expressions, minimizing in real time, removing comments, etc. Is this what you are looking for? If so, I think every time it was taken, maybe 10 hours of max to write, debug, and implement a handler ... not so bad, considering all the advantages.
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