Not exactly what the OP wanted, but I wonder if there are any chance of extending the popularity spectrum on both sides?
From what I observe, people pretty much prefer flying widebodies over narrowbodies for its extra stability in turbulence, less cramped interior, etc. However the current spectrum only goes from -5 to +5 for jets (-5 to +2 for props) and I think perhaps it could be widened so that the slight preference towards western aircrafts and widebodies can be reflected?
Here is an example that illustrates my idea.
+1 for older Non-western Turboprops
+2 for older ATRs and Q100-300, etc for their age and New Non-western Turboprops
+3 for ATR-42/72, Dash 8 Q400, etc (Max for Turboprops)
+4 for 737-300/400/500 for its age
+5 for MD-81/82/83 for their age, small RJs and Russian RJs
+6 for MD-87/88, Western Regional Jets (Max for Regional Jets)
+7 for 737-700/800/900, etc for being narrowbody (Max for Narrowbody) and widebodies made in 70s - early 90s (Classic 747, L1011, DC-10, earlier versions of A300)
+8 for Russian Widebodies and widebodies made in 90s (MD-11, newer versions of A300 and 747-300)
+9 for Western Widebodies (Max for widebodies)
+10 for jumbos (Max)
I am not sure as to Russian narrowbodies because AS seems to put them on par as western ones, similar reason for differentiating MDs and 737s (legit tho, because MDs are much quieter for most part of the cabin)