If you set a B5 rack with several patches, you will have it instsantly, especially if you pre-load it. However, I can pull it up very quick. The UVI workstation has really improved, and B5 will now save any preset you have pulled up in a song, i.e., I could load B5 as a regular plugin, modify any drawbars or other settings, save it to state, change it to any other setting, save the song. It will be there.
EDIT: I should also add that if you load from plugin, you will have to select B5 2 to load it. This is why I save whatever I choose for the song, and save it to song. Having it in a rack would also bypass the selection process in UVI Workstation, which is similar to anything in Kontakt.