I like your proposed changes. They would definitely be cool. New changes require a new name. Instead of the J. Kepler, your new model would be called the Tellurium N. Bonaparte. < :D
... with functions for calculating wind direction/velocity, trajectories/distances of projectiles when weight/force are entered, dispersion patterns of canister/shrapnel when height/charge are entered, etc.
He would have loved something like this. The perfect gift for the man who has all of Europe and wants more. I once attended an auction preview and held in my hand the sterling silver compass/sundial he carried through his campaigns. It had originally been made for Louis XIV, who probably never even used it.