if you do, do not go with the newest and shiniest! do some research and get something below 11.3.0 and use safe a9lh installer.
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@xerpi In the future, you could add a "/sdb/" to the mix that gets created at first boot up. this would allow you to basically Chroot in that dir or treat it as a "shared folder with r/w permissions" doing this would allow you to have a basic update/ upgrade system and eventually the addition of apt. also, another useful idea to go with /sdb/ as a storage dir is the (maybe) ability to use dpkg and install the packages to /sdb/.
Could this possibly work?