You could get a new drive that way you keep your working version intact while you play around with other options. If you want to install HA OS on the NUC, there is an official image you can use.
If you use system for other things, you can try Proxmox. This method allows you to install the HA OS as a virtual machine and then also run other VMs like Ubuntu or Debian, etc, to run other software outside of the HA ecosystem. Keeps you fully supported, but is a little harder to set up initially.
You can also try a Debian 10 Supervised install. If you want to stay supported, you can not use the underlying OS for anything else, like Plex.
There are benefits and disadvantages to both methods.