OK here is one item I drag across continents to make sure I have.
Battery operated hair clippers.
They will gently, and without cutting the fabric, part your erroneous seams like magic!
Get at the pet store, or even the dollar store, in CA. The smaller the better so you can have one hand free and one for the cutter. I almost never use a seam ripper now. Clippers can be pretty lousy quality and still last years as all you are cutting is thread in a line.