Yes it can work, sort of, but there are limitations. Roaster ovens don’t have precise temperature control, but if your ambient conditions are relatively consistent (as in a kitchen in a normally climate controlled home) you should be able to to dial them in to reasonable precision. Way less than an immersion circulator, but maybe enough for the purpose. But another problem is that, unlike an immersion circulator that keeps the water moving, the water will be still in the roaster oven. This will slow the heating effect, and make it possible that the product closer to the heated surface will be exposed to higher heat than the product farther from the heated surface. Again, these differences may be tolerable.
A roaster oven powered though a PID (I use an Auber) is my #1 go-to tool for making stock, because it is safe, stable and high volume (mine is 22qts). But I think that an immersion circulator is a better way to go if you’re trying to do a sous vide cook.
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