Best practice for CMS-Integration (not PULS,OCTOBER etc...)

BLOCS ist one of the best (!) web design tools in the responsiv world (2016-20xx).
There is no need to discuss this.

Are there any best practise tipps to use an other CMS then Pulse, etc…

Our Base equipment is CKeditor and CKfinder and a very large Database with html5 Snipplets.
What ist the best way to integrate own HTML Content in BLOCS. Searching an ID and replace the Content, or looking to an CLASS combined with ID, or Searching and switching some Classes…

The idea is to built a website with BLOCS. Export the website. Then open with PHP file_get_contents and replace DOM Object content by searching IDs oder classes.

@NORM:excellent work