The VC64 was based off of Kjaerhus' Golden Channel plug-in.
If you get your hands on one (the company is longer around and the plug ins have become shareware/freeware) You might find similarity's in the 2 plug ins.
I personally do use the SSL plug ins from Waves because they can dial in compression and frequency very nicely with an analog resemblance of the SSL. To be honesty, its no SSL but it does have harmonic overtones of one.
My personal favorite is the SSL G bus compressor. It was the sole reason I bought the SSL 4000 bundle.
My advise is, use the Adaptive limiter. Its very transparent and can handle a lot without hearing a huge change.
Time to give up on the old plug ins my friend

. But I know where your coming from. Im still worried about my trusty Sonitus bundle. Its only a matter of time before those are no longer supported.