Forgive me if i maybe wrong about how i see what kind of person you are.
You are exhibiting a character of a SOCIAL CLIMBER.
What i posted would burn a hole in your pocket for a total of P10,800, if you have a car of your own. If not get a taxi and you will spent even less for the transport. Definitelly it wont reach 20K.
Now you are looking at 20K

And telling us here that you need more time to save?
If you cannot afford it, my advise is BE REAL. Karon pa lang show your bride-to-be your real score.
At least both of you won't be hurt in the future.