Undead thread!
Just wanted to mention that i just did this, and it works great! I still prefer the paddles ,but using the shifter stick feels
much more intuitive now -- "grab" the next cog gear by pulling towards you (i.e., down), "push away from you" (i.e., up) to slow down and drop a cog -- like a proper sequential set-up.
No issues, no CEL's, no change to how the paddles work; works perfectly as described by the OP
EDIT: Add a snazzy boot to cover the whole thing, and no worries about the "+" and "-" being opposite to actuation
-- looks nicer too!
P, N, and R are indicated on the digital display, so the console display is redundant anyway.