I've spent some time thinking about this and I pretty much agree. Armed neighbors are fine as long as they are friendly, proficient, and not complete idiots. In my case everyone who meets those criteria has already armed themselves.
The idea of arming someone while also trying to teach them how to responsibly and proficiently use a firearm in an emergency situation reeks of fantasy, at least within the context of likely disaster scenarios here in the US.
As for the OPs question, choosing to circumvent laws is pretty much always a risk vs reward proposition. In your case you seem to be trying to decide if the possibility that some potential SHTF situation that might happen someday is justification enough to completely ignore the NFA in the present, to the extent of maybe even building unregistered and illegal items (e.g. your reference to "solvent traps").
That question is easy for me to answer for myself - I absolutely will not be building off the books NFA items, period. It seems unnecessary and ill advised to me, especially when, between AR Pistols and actual NFA items, there are plenty of ways to check that box if you see fit.
But again, the question seems to be based more in fantasy than reality.
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