All you need to do is let the keg sit in oxyclean for an hr or so, rinse well, add starsan. I wouldn't call this difficult at all.
Humm, you don't need a special tool at all! Where did you get this information? All you need is pliars, and a standard screwdriver. It takes 35sec to remove the spear and about 90sec to install it.
You can auto siphon from your fermenter right into the keg with no issues what so ever, again false information. You only need an extra coupler with the check valves removed if you want to do keg to keg transfers or your to lazy to remove the spear.
Jason