How to change the implementation (detour) of an externally declared function?

Yes you can do that, using the ReadProcessMemory and WriteProcessMemory functions to patch the code of the current process. Basically, you get the address of the procedure or function to patch and then insert a Jump instruction to the address of the new procedure.

I think JCL has some utils for this kind of stuff... I haven't used it myself but had a quick look and following items look promising.

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