Review the Samsung Galaxy Xcover Pro
Type of work:
The modem isolation has not been looked at yet. For that finding / downloading / requesting the kernel source code should be sufficient.
If the device is not supported in LineageOS yet it might still be worth looking at its git repositories as something might already be there.
If not we would need to look for custom rom source code in XDA or in github.com/customroms.
If not we could still download the tarball on opensource.samsung.com but that will probably not have any git history.