Don't put a second spigot on your fermenter. In fact, it shouldn't have a first spigot, but that's a subject for a different rant.
IMO, there's entirely too much reliance on the "a hydrometer reading is the only way to know" mantra. This is BS. It may be the only way to get a number, but there is rarely a need to take a reading at multiple points in the process. I take one at the beginning, and one at bottling. I have never suffered for not opening up the fermenter to draw a sample at some intermediate time. If I were trying to rush the batch into bottles at the earliest possible hour, I might take extra readings. But I don't brew that way.