1) If I obtain a gun now legally and violence and unrest occurs, I expect the government to seize my firearm. I might also face an undesired level of scrutiny for having even registered a firearm in the past.

Correct. Interesting side note, in the plans that Nazi Germany had for taking over a country by subversion, a section included locating those members of a the said country who had gun ownership and removing the firearms by any means possible, including trumped up charges. The other part was to subvert those in charge – ie blackmail, threats etc.. and if those are not effective, make them vanish.

2) If I obtain an illegal gun now so the government won’t know who to confiscate it from, I am making myself a criminal now which I don’t want.

Or learn to be a gunsmith.. so you can make one if the need every arrives. This way you don’t break the ‘registration’ of the firearm and get yourself in trouble that way… even though ‘registration’ is technically unconstitutional. It infringes on the right by requiring an action in order to own a firearm. The 2nd amendment says “shall not be infringed”.. not “shall not be prevented”. This was to prevent hegemony against the right through successive restriction.

But I know that if it becomes known that I have necessities that are scarce, I’m making myself a target. That is the big reason I’m thinking of home defense.

Are any other non gun owners thinking similar thoughts?

I am more concerned about the government than the citizenry. Usually the citizens pull together in time of trouble while the government is more concerned about maintaining its authority..