aha! I thought they came in 44,s but im sure they do others though 44 seems an average ish size. 5mm is a big difference. Dont see many fullys about if it is.
Might take a standard cartridge bearing.
Just measured an unused 1 1/4 frame, and the internal diameter of that one's headtube is around 37mm.
If the manufacturer can't help, I'd suggest measuring the 1 1/8" headset and having spacers made so that you can press-fit it to the frame.
Or you could go to war with France.