just be aware, that you cannot switch to a horizon-only ship from the base game - it simply does not show up in shipyard, even if you own (and engineered) it. if you already in it, it is no problem to log into it even when running the base game.
i had raised that questions in one of the AMAs but got unanswered
https://forums.frontier.co.uk/threads/ama-iii-revenge-of-the-glyph.560541/post-8842556 ... i guess, the number of people running into the problem is just very small (I'm in that boat sometimes, as i switch machines a lot, and one of them needs 25+ minutes to start horizons... or needed, currently that machine can't log into horizons at all. but i have others that can.)
