"Should" is a matter of player preference.
You appear to be moving on from "understanding the game" to "personal challenges" - respect for that. But whether or not to bash metalcrafts is a judgement call. (I'd say "yes", because it seems so much a core part of DF - but if you want to ignore smelting, and just work with ores as stone, that works too.)
As for no cooks/etc, I don't think it's possible to get 100% of your provisions from a caravan - but maybe. The tough part would be lasting until the second caravan shows up - when your requests from the laison kick in - because the first caravan will not bring you enough food/drink to last. So you'd have to stock up heavily on food and drink at embark, enough for... oh, maybe 6 seasons, to be safe? (You'll get "some" stuff from elves and humans - ~if~ they're on the map and arrive safely!) And if you expect migrants... well...
da math:
2 meals + 4 drinks/season/dwarf, on average.
7 dwarfs x 6 seasons x (above) = 80+ meals & 180 drinks
If ~10 migrants at Winter, that's another 60 meals & 120 drinks
If ~10 more at Spring, that's another 40 meals & 80 drinks.
- less whatever you hope to get from caravans.
Helluva challenge. Maybe not even possible - it'd be tough, at best.
Also, if even one caravan gets ambuscaded by gobbos, it's game over - which means military escorts, which gets us back to metal bashing. (Altho' you could slide on the anvil at first, and hope to pick up that slack before the first ambush.)