Is not more simple to download the Jack windows version and test if will working at the same Linux way?
Just run Jack and look who will take the ASIO audio-midi port.
then run the B4II.exe and more other standalone.exe application and try to connect, simple.
VSTi have Nothing to do, they need one ASIO host or they can not opened.
If you get the same configuration as my Jack shoot here, try to test IF each ASIO.exe Do you have there some basic windows skill or not??