Right, rather than spend £500 with Ribtec (you think I am joking) why not try this.
Painter from the "U" bolt on the out side of the hull attaches to an ordinary grab hand or cleat inside the boat when travelling as normal. when you want to anchor, chuck the anchor over the side allowing 4 or 5 times the rope and chain to the depth. Tie a loop in the anchor line when it goes slack and then tie the painter to this loop. Let the painter go, but keep the spare end of the anchor rope in the boat. The boat will ride to the painter and u bolt and most waves will go under the boat as the nose rides up and over, unless you are out with the NWR who only go out in F6. When you want to go home use the spare end of the anchor to pull in the loop, untie the painter then pull in the remainder of the anchor line.
If the anchor line goes over a tube its going to get very tight in a strong tide and mark the tube or possibly worse. In addition the baot won't ride as well to the waves as the bow is being held down and the waves come over the top.
alternatively buy a Ribtec, boat show ones have them as standard.