It would be useful to know what the attraction is, since if you try to create an alternative, it might not be satisfying enough in the key aspect. Bath faucets

It would be useful to know what the attraction is, since if you try to create an alternative, it might not be satisfying enough in the key aspect. Bath faucets are quite large, maybe the water output is quite chaotic, there's a significant drop/splash, and the bath (metal, acrylic?) could be quite resonant - as maybe the bathroom if it's tiled. For a first step, you could turn off the main house water (assume this is controlled elsewhere) briefly until your child loses interest and leaves the bathroom.