You don't need to max anything to salvage. 900+ metalworking, woodworking, leatherworking, clothworking will do nicely.
Cheapest and easiest way to do this:
1) trinket to 500 in each of them. Total cost about 10g.
2) 200 tailoring. Cost <1g.
3) 200 armourcrafting. Cost <1g.
4) 100 weaponcrafting. Cost <1g.
5) 300 fletching. Cost about 5g.
At that point, you should be about 900 in each secondary, and able to salvage anything that comes along.
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Angharad Macsen, Legendary Smith
Alfwyn MacLlyr, LGM everything
Jaelithe Tregarthe, LGM everything
Elfwine Llyrsdottir LGM SC, WC, Fletcher, Siege