Commercially available solutions seem to use a flow of nitrogen to purge condensation from the nozzle, which is quite a bit more complicated: https://www.weh.com/en_us/general-news/preventing-the-fuelin...

Yes, to comply with paranoid hydrogen safety regulations cheaply. Also, note how the nitrogen is also being used to purge the entire line. Not just keep condensation away.

With more engineering work an intrinsically safe PTC heater could be certified and used just fine.