I've thought about it, but you'd have to elongate the legs which would increase height. I'd be more interested in a nice welded valve than a trub dumper myself.
If you just want the yeast though, you can use my way (actually stolen from some other guy on here): remove the dip tube, as it is useless, ferment as normal, then after racking all the beer off the yeast, gently swirl until it's all suspended in the last of the beer, then just tip sideways and use the valve to let the yeast out. Works.