I believe this is still relevant to the OP's initial question about Speidel fermenters in general, if not, my apologies
When I reassemble the spigot I spray the individual pieces with starsan and put it together. Spray the threads on the fermenter and attach the spigot. The spigot itself has a small collar that fits in the fermenter opening, once tightened up I doubt there is any wort that contacts the actual gasket. The inside of the spigot body is smooth and rounded with no crevices and made from the same material as the fermenter itself. The hole in the spigot body is oval and probably 1/2 in sq in area and that is the only spot where wort contacts the actual orange spout of the spigot.
I put about a gallon of sanitizer in the fermenter and put on the lid using the solid cap. Roll and swish for a few minutes, then open the spigot and empty a bit of the starsan, close it, then dump the remainder back into my starsan bucket from the top. Invert the fermenter on an empty 5 gallon bucket and cover the the spigot with a piece of foil to keep dust out until I'm ready to rack.
Once brewing is complete, pump the wort into the fermenter, aerate with O2, pitch and put on the lid with stopper, airlock and thermowell. Replace the foil with a sandwich bag secured with a rubber band and place in the fermentation chamber.
On kegging day, move the fermenter to my table, remove the plastic bag and visually inspect the spigot to ensure it is still clean, so far it always has been. Spray starsan inside and outside the nozzle, open the spigot and drain about a half pint to clear any accumulated yeast/trub into a pitcher. Slip on a 3 1/2' piece of sanitized 1/2" silicone tubing, the other end goes to the bottom of the sanitized and purged keg. Loosen the collar on the lid a bit to vent, open the the spigot and fill the keg in 3 - 4 minutes.
This has worked for me for the 40 or so batches I have done with the Speidels so far and I am completely comfortable with this procedure, but I ensure that I do not become complacent or careless...