Because of the sizes (34.8, 35, 36), the only thing you can do is convert any of the smaller ones to the Italian 36mm. And Italian BBs are still made so there are no issues finding them. I have a french frame converted to Italian threading and use a 2mm spacer for the width difference. Gives you a little bit of chainline adjustment to play with as you can put the spacer on either side.
__________________
72 Frejus (for sale), Holdsworth Record (for sale), special CNC & Gitane Interclub / 74 Italvega NR (for sale) / c80 French / 82 Raleigh Intl MkII f&f (for sale)/ 83 Trek 620 (for sale)/ 84 Bruce Gordon Chinook (for sale)/ 85 Ron Cooper / 87 Centurion IM MV (for sale) / 03 Casati Dardo / 08 BF IRO / 09 Dogma FPX / 09 Giant TCX0 / 10 Vassago Fisticuff