Towel rad off HW system?

So this is something I’ve been pondering for a while and just wondering if there’s anything I’m missing, or it’s perfectly viable?

For context, we have a CH radiator in our en suite, we also have an electric towel heater. The towel heater is useless really, it takes ages to get to temp and it’s switched via an FCU in the room next door (it’s a jack and Jill configuration).

We’re going to do the bathroom up, I want to nick the electrical connection for UFH purely to take the edge off the tiles, leave the CH rad for warmth, but I’m thinking of adding a towel rad that’s in line on the shower feed. In my head this will get instantly hot when the showers turned on, warm the towels prior to use, then remain warm enough to (mostly) dry them afterwards. It seems so simple, but I’ve never seen it before so am I missing anything? Am I going to forever have issues with air locks?