Sorry to hear about your Pro Tour. Unfortunately, this is the one production bike ever made that had braze-on center pull brakes. Normally they were found only on expensive custom made bikes. Your only option for direct replacement with a stock frame is another Centurion Pro Tour.

Cycles Toussaint do sell a frame with factory braze ons, but it is 650B. 650B Frames | Cycles Toussaint

Peugeot in the 70s made a semi custom version of the PY10 with braze on center pulls also, but I've never seen one other than in pictures.

Many custom frame builders will offer this feature as on option, so a custom frame is a possibility. Ebisu would be my first choice, but there are many. None will be cheap. Maybe Mercian would do it. You could ask.

Another option would be to purchase a vintage touring frame, Trek or Miyata or whatever you can find with a top quality tube set: 531, Champion 2, etc) Try to find one with trashed paint for cheap. Have a framebuilder put the braze ons on it, and then repaint or powder coat.

DIA-COMPE Center-Pull To Braze-On Assembly Kit for one Brake | Cycles Toussaint