Here is my impression of what your film curves would look like if they did not include flare.
I compressed the Log E scale in the toe by taking what I thought was a reasonable speed point.
Using that as if it was equal to EI 320 which is by definition -2.6 Log mcs.
Add 0.4 Log E flare to that = -2.2 Log mcs.
The difference (arithmetic) is 0.0038 mcs.
I then built a compressed scale by adding 0.0038 mcs to each 0.1 log increment going from the speed point to the right until it stopped being significant.
Some example values:
-2.6 Log mcs + 0.0038 mcs => -2.2 Log mcs
-2.5 Log mcs + 0.0038 mcs => -2.15 Log mcs
-2.0 Log mcs + 0.0038 mcs => -1.86 Log mcs
-1.5 Log mcs + 0.0038 mcs => -1.45 Log mcs
-1.0 Log mcs + 0.0038 mcs => -0.98 Log mcs
By -1.0 Log mcs the difference caused by flare is 0.02 Log mcs which is insignificant to me.