I have a bathtub with no shower, I would like to connect a hand held shower to the bathtub spout (without removing the spout). I found a "portable shower attachment" product on Amazon but it seems that a) it fits only circular tub spouts (mine is almost circular but not completely so) and b) they don't work well under higher water pressure. I am willing to accept a kludge that doesn't look very good. Low cost would be what i'm looking for. I don't need anything fancy as long as the connection is good and durable. Since I am renting though, the setup can't be permanent. What do you think would work?