Okay I am confused, and I don't seem to have any code that edits a resolver.
This would be easier if you had pasted your code in this thread, but anyway:
You don't need to superload the file to edit these functions.
You should be able to overwrite them at any time in your code. The best time for "any time" is in your addon's "ToME:load" hook.
By the time that hook is called, all resolvers should have been created but not yet resolved, and they are all stored in a table that can be accessed by just typing resolvers.whichever_on_you_want...
So add in something like:
resolvers.calc.moddable_tile = function(t, e)
whatever you want...
Note that this is basically overwriting the function, so if anyone else does the same thing there is no protections for allowing both of you to do that safely.