I’ve never seen an integrated device specifically for bathroom drying, but this approach is very common here in Taiwan. I have a dehumidifier and clotheslines in my bathroom. Multiple people showering is never an issue. The dehumidifier (on clothes drying mode) brings the humidity down to 35%. A shower briefly brings it back up to 65%, but the vent and dehumidifier bring it back down pretty quickly once you turn the water off and squeegee the glass. The bigger problem for me is that if I leave it running overnight it dries the entire apartment out and I wake up feeling dehydrated.