There is nothing wrong with your method. You can do all the testing of tracks you need to in BiaB prior to adding them to your DAW. Once you get the tracks you like move them over. Continue there.
One suggestion is to try the plugin. It doesn’t bite. Maybe it doesn’t do everything the main program does, but it was never meant to. It is a “lite” version. Once a song it moved to the DAW, it is easy to open the BiaB file plugin and test any extra tracks that you may may dream up there in sync with the DAW. A great little tool.
On the subject of adding all BiaB functionality to the plugin, it is simply not possible to add everything a deep program like BiaB does to a VSTi.
Plus it is not necessary.
Here is an illustration. Do you throw away a leatherman tool (
https://www.leatherman.com/wave-10.html) simply because it doesn’t do everything you complete set of tools does? No it is convenient for small fixes, but you would not build a house with it.