Testing using VS2019 Preview version

I have both Visual Studio 2019 and the latest Visual Studio 2019 Preview 
version installed in separate locations. I have no problem testing a 
Boost library using VS2019 with the normal msvc-14.2, simply be having 
in my user-config.jam:

using msvc : 14.2 : : <cxxflags>"/Zc:__cplusplus" ;

Is there any easy way I can test with the VS2019 Preview version ? I 
would even be willing to temporarily replace my user-config.jam entry 
above with something else which would find and use my Preview version 
instead of the normal regular version of VS 2019 if necessary. I can 
always change it back to test the normal VS2019 when necessary.

Any help would be appreciated.

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