

7zip is an archive format - creating an iso requires the raw files (unless you have 7zip installed in the VM to extract the zip file).
All that is unnecessary though, just enable a shared folder via the VM software (I assume they all do it now, VMware has had this feature forever). This isn’t a network share, it’s a virtual network share that only exists within VMware for that specific VM, and by default it’s read only.
Or put the files on a thumb drive, and connect that thumb drive to the VM.
Or enable networking on the VM, copy the files in, then disable the network card in the VM.
Getting the files in doesn’t require any special security, it’s when you’re executing the files that the VM needs to be isolated.
If it’s bootloader unlockable, at least we’ll be able to flash a rom like Lineage.
I could go for one of these at $200, so maybe as a second-hand device in a couple years, if I can flash Lineage.