I recently bought the Celestron T-adapter (55 mm total length) for my Evolution alt/az mount, and now have the same issue as you when I add my Meade f6.3 reducer.
At the time, I was considering this adapter from Sirius Optics but eventually went with Celestron one. Would this be a solution for you? Maybe you would not get the full f6.3 reduction, but at least it might fit ...
http://www.sirius-optics.com.au/siri...r-for-sct.html
Andrew