Is there a way in which to combine the Yii2 Advanced Framework with both a custom frontend (PHP/HTML) template as well as a second custom backend (PHP/HTML) template so that it truly resembles and behaves like these Pixelcave Templates? I have found a few answers (How Can I Customize Yii2 Theme and Yii2 Theme Integration describing how to apply just bootstrap and color changes through views and asset bundles but unfortunately little about how to convert Yii2's default settings for its navigation/linking/widgets to match the HTML structure I'd need. While there is much documentation on Yii2' framework site, many theme-related posts/blogs span back to 2011 (Yii1) and I fear I need more specific examples.
So, is there a way to make them compatible? If so, what steps do I need to take? If not, what PHP frameworks would be easier to manage this with? As an aside, the templates are built with Bootstrap 3.