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SHR is just bog-standard Linux mdraid and LVM. This should be mountable from almost any Linux. So, you could switch without reformatting.
You should be able to install e.g. OpenMediaVault to an extra disk (or USB drive) and it should detect your SHR (According to this).
OMV supports Docker containers so installing additional software should be easy.
If you just want a NAS, TrueNAS core and zfs, probably.
If you want to run services, run docker on an OS on bare metal and either zfs or two mirrors, optionally joined with lvm. I don't think I'd recommend putting all four disks in one array.
Personally I run a bunch of stuff, so I have docker on alma on proxmox.
Alternative is buying used disks. Locally I could find them for 20 a piece
To go with this you can also look at https://www.goharddrive.com/. They provide white label drives and refurbished drives with a three year warranty in my case. ~$110 USD for a 12TB Seagate Ironwolf.
The reliability could be hit and miss no? These could have a bajillion hours on them, depending on where they came from. 20 may be a bargain, until you have to keep replacing them every 2 years or less. Just guessing here.