Sorry, YOU must change your links and write the mod_rewrite code to actually serve the file you want it to serve (your mindset is backward).
I have a very long tutorial which tells you everything you need to know about mod_rewrite - including a number of coding examples - linked in my signature.
As for the modelcode or other strings, if you don’t need them (or don’t supply them to mod_rewrite in the requested links), they will not be read because they’ll not be present.