Since your appeal time is now completed, you need to spend the minimum time in Jail without any option. Also please check with some legal expert or lawyer if your jail term can still be converted in fine system since this option includes in your appeal option I believe.

If the verdict is for 3 months then you will be actually staying only for then 2 months since 24 hours of your stay will be counted as c1.5 days. I know it is still tough but you need to honor the law where you are living. Drink driving is a very big offence and most of the cases it comes with deportation order after jail term.