The last time I tried it this worked for chrooting into any OMLx system:
How to use ‘Live’ OMLx iso to repair broken OMLx system
Like a lot of people I had used an older method for years going back to when I used Fedora (starting with FC3) but one day I discovered that no longer worked with OMLx systems. So I got those instructions from @bero.
It has been some months since I last tested this but I know of no reason why this would not still work.