Sounds like the magic wrapper isn’t coming to us anytime soon.
"Why won’t my 3rd party externals run inside the 64-bit version of Max?
All Max externals need to be ported and recompiled. An SDK will be forthcoming. In the meantime, we would suggest you try rewriting patches to use standard objects and abstractions if you want to run them in 64-bit, until specific 3rd party objects are ported to 64-bit."