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I'm not sure how much help this will be, but it looks to me like Sage has GiNaC built in, so there should be a way to create and manipulate GiNaC objects from Sage . . . it looks like the contents of, e.g., sage.functions.trig do this for some trigonometric functions; those classes are based on GinacFunction, from sage.symbolic.function, which looks like it might take an arbitrary GiNaC function as input . . . but maybe it only allows selected ones -- I'm not sure about that.

Good luck :)