Yeah, I am.
I had wondered if that was the case but when I had a quick browse through the thread, I couldn't see anything that specifically said so (famous last words, it's probably plastered all over the place but me being me, I missed it).
I don't suppose anyone might know of something to do a similar job with modern skins?
I was struck by the idea of searching for a general purpose program that might fulfil my needs as opposed to a WinAmp-specific solution and, eureka, I have it.
The NuonSoft Shell Enhancer.
At first glance it appears to do what I want, though it's 4 am here and I have work, so I'll report back later when I've given it a fair go.