It's a good bet that Tange has a French headset that will drop onto the PX-10. Granted, they are not made with magic dust. But a frame stiffer and tougher on headsets than a PX=10, will in my experience reliably get 8000 miles from any of the Tanges (another 1-2000 after upsizing the balls one step). Not bad for $30 and they look decent on C & V bikes. You can also mix and match their headsets to get the stack height you need. (The washers and nut of the $8 OEM Tanges are very short. So is the bottom bearing. You will need to seal it, (innertube) or fill the race with marine grease and use a mini fender.)

I like Tanges a lot. Put it in, have it right by the end of the first ride, tweak it once a year and replace/re-ball at 8000 miles. That's it. Hard to beat for $30 and far less sweat of my back than some of the headsets I paid far more for. That said, the roller Stronglight on my Mooney is a pure joy. 25,000 miles and perfect. Never needs anything. Just wish it had steel wrench flats.

Ben