You might set the meter to incident mode, retract the dome... run the negatives across the incident sensor and take readings...
Very roughly, a negative might get 1/2 stop "denser" for each full stop additional exposure. So I expect you to find one f/stop difference between the lightest and densest negative in a series.
Interesting. Will definitely give that a shot.
"Once the amateur's naive approach and humble willingness to learn fades away, the creative spirit of good photography dies with it. Every professional should remain always in his heart an amateur." - Alfred Eisenstadt