Alignment - it can't be done?

Incorrect toe does not mimic camber wear. That tire has camber wear. So many variables here.
mim·ic
/ˈmimik/
verb
1.
imitate
synonyms: imitate, copy, impersonate, do an impression of, take off, do an impersonation of, do, ape, caricature, mock,

I guess you didnt actually read my response.
I stated it appears to have too much neg camber 1st & foremost.
I added to start with square one stock settings ON EVERYTHING..this will eleminate many of the variables involved.
I also said that once the tire tread is gone, toe out can in fact look (to the untrained eye), like too much neg camber.
*See definition of mimic provided above*
In an excessive toe out condition, the inner leading edge of the tread is scrubbing the contact surface of the road as the car travels in a straight line, thus it wears out 1st. tread will appeared "feathered" until its all gone, then its hard to tell the difference. Its also quite possible that all settings are jacked wagoned up..so its not just camber issues here, but caster as well. Last time I checked a proper alignment checks & sets both.
Since we dont have/cannot tell in person what the tread looked like prior to it being totally bald on the inside edge, we cannot know if the car was bump steering, dog legging, pulling to one side, is even level.... and OP doesnt seem to know, its anyones guess as to the actual cause.
The one alignment shop couldnt even tell in person, perhaps thats because they are ignorant to all thats involved in a near 50yr old mopar..or that the car is simply too far out of spec and they dont want to deal with it for a quick $100 alignment job.
I once had a torsion bar unwind on me at the hex end (had hogged out the frame mount somehow) and the car would drastically change alignment simply driving down the road. Took forever to figure it out. One would assume that couldnt possibly ever never happen. but it did.
So... like others here, I was including other possible variables, just as you mentioned so factually, there being.