I am afraid that you are out of luck
Maq Attaq!
If your microSD card is that old and small it will not be able to be formatted to EXFAT. Even if you could, the file headers, etc; in EXFAT are larger and would reduce the available space on the card to below that which you require not to mention that the card will probably not be, say, a Class 10 with fast read/write speeds. Typically, you should be looking at getting, say, a 32GB or higher,
SanDisk Ultra 32GB microSDHC Memory Card which, if memory serves me correctly, usually come formatted to EXFAT.