^^ Wow, those were two pretty long sentences. I think I understood what you are wanting to communicate, but please excuse me if my answers are completely unrelated to what you need.
Replacing a fuse with a higher rating is not a very good practice. That is bad for the central locking system, because now you are allowing more current than recommended to run through the circuit. Hoepfully, everything will be fine. However, in all likelyhood if anything goes bad now, it will not be a fuse, but the actual central locking system may say its farewell.
Before you go out looking for remotes, you need to know what kind of alarm/keyless entry system you have installed in your car. Once you know that, come back and let us know. You can inquiere with your local dealership whether the car came with the factory keyless entry system. If that is the case, check for the price of remotes with them.