Install Octopi (Octoprint) with PINN dual boot with LibreELEC

Hi,

I recently went on holiday and used my Octopi as a LibreELEC for the Catsitter that was taking care of my cats. I made a backup of everything, so all is fine, but I'm kind of low of Micro SD Cards and I wondered if it were possible to install Octopi (Octoprint) along with a another OS on the same SD Card using PINN.
I know everyone would recommend me using a second SD Card but, that is the whole point, I want avoid that. Most of them are too large anyway, it's kind of waste, and a hassle to change them. I keep physically breaking them when trying to fumble them out of my very inconvenient SD Card reader. Happened just yesterday. Would be very nice to simply boot Kodi before holiday and Octopi after holiday.

I tried to follow this tutorial:

Now I failed because I need alot of Partition information in json files and what not else, I think I read that Octopi is based on Raspbian, could I use those jsons ?

$ cd ~/os/Raspbian  
$ wget -N "http://downloads.raspberrypi.org/raspbian/os.json"  
$ wget -N "http://downloads.raspberrypi.org/raspbian/Raspbian.png"  
$ wget -N "http://downloads.raspberrypi.org/raspbian/partitions.json"  
$ wget -N "http://downloads.raspberrypi.org/raspbian/marketing.tar"  
$ wget -N "http://downloads.raspberrypi.org/raspbian/partition_setup.sh"  

Could someone point me in the right direction please.

Thanks