[vettestr]

The master cylinders most often can be rebuilt but at a cost of 41% of a new replacement ...? Many are made of aluminum and the bore becomes pitted from the moisture/water absorbed by the fluid. If pitted honing the bore for proper seal fit is more difficult but it can be done in most cases.

Making a short steel line for each old rubber line may reduce the diameter enough to stop interference with the pedals as a guess??? Can you get to area well enough to fab steel lines past the problem area, you mentioned re-routing was not an option? You will find a fix I am sure.