You should be able to get it working by using the standalone version of Viper if you are downloading and using it from GitHub, or you can just link to the same CSS and JS files that are used in Edit+.
Have a look at the example implementation in that GitHub repo as well for how to run it standalone: https://github.com/squizlabs/Viper/tree/master/Examples/Modern
To use it on an Asset Builder that is already using the classic WYSIWYG, you might have to do some trickery where you manually output the hidden field that normally would get printed using a keyword, and then initiate Viper manually against it.
We are planning on making this easier once we deprecate the classic WYSIWYG and bring Viper into core for Matrix which is scheduled for later this year, but you should be able to work around it with some manual minor frontend dev.
Let me know how you go.