Using HLS to combine 27001 with other standards

I'm assuming that by HLS you mean High-Level Structure.

Considering that, please note that all ISO management systems reviewed/released since 2012 have the same basic structure:

• organizational context
• leadership 
• planning 
• support
• operation 
• performance evaluation 
• improvement 

This allows the standards they make use of similar requirements, which makes requirements mapping integration easier.

For further information, see:

• How to implement integrated management systems https://advisera.com/blog/2015/10/05/how-to-implement-integrated-management-systems/