It would seem that Intel was heading into the next generation when they developed the fsb 133 cpu. The BX chipset was from 1998. The 810e fsb 133 chipset hit the market in 1999 and so did the B and EB cpu's. This would indicate, besides other implications, that Intel never intended that the B and EB cpu's should be used on the BX chipset. It seems you try to find a way to combine fsb 133 -and- ISA -and- BX chipset but ISA was phasing out at the time and so was ISA.
In shorthand: fundamentally the BX chipset and fsb 133 represent 2 different generations.