processDoubleReplacing for VST 2.4?

Seeing the growing number of Reaper users I get requests every now and then to support full 64 bit (sample) processing, which is possible with VST 2.4. This would mean that the VST wrapper would need to have something like processDoubleReplacing. I think one could simply copy-and-paste processReplacing and call an overloaded filter->processBlock(double…) in it? Or is there anything I miss?