I love half chaps with paddock boots. In Mauritius can you get catalogue purchases? Such as from Dover ? (please forgive me, I don't know where Mauritius is. I am so ignorant!)
Another option is to buy tall boots to fit your foot, then hire a skilled leather worker to cut a notch in the calf portion and resew it to make it smaller , like tailoring a suit or dress to fit. It may not look perfect, though, if the tailor must remove a lot.
I agree that since you are new to riding, it is better to get paddock boots and half chaps for the first year or two. Then spend the money for tall boots.
Good luck and welcome to the forum!
(PS I have the opposite problem; I have a relatively short leg but FAT calves!)