Well if nothing else, since we just had the Farholme Pass with a Compass and Damascus Blade, Shrikewood will be up in 2-3 weeks with a guaranteed Sturdy Shield.
We don’t know the completion loot for Wonderland yet, but it’s very possible the Epic or Legendary tiers will have a Sturdy Shield too. If not, Grimmforest in March definitely will.
I hope you get lucky and get them sooner from loot, but at least guaranteed sources for Shields are within sight. 
So hold on a little longer, the end of February might not quite do it, but by mid March you’ll be good.