There aren't many plants that fit that description. The only genus that would meet your needs are in the spirea family. There are pink flowering spireas that are pretty compact. I can't think of anything that fits your needs. Altheas do have red forms, but they are much taller than azaleas. You can do an Advanced Search on our Plant Encyclopedia on this website, but I'm not sure if it will turn up much. You don't have a lot of options in those colors and those sizes. Again, spireas are all I can think of. They mostly come in white, but there are some lovely pink-flowering forms.