i never tried it but i gues you could create a array of fonts on start and then
just selesct the font you want white the array (just a lot of memory use)

i think somthing like this

FONT* font_arr[100];

function create_font_startup()
{
var i = 0;
while(i < 99)
{
...
font_arr[100] = font_create(...
i+=1;
}
}

function main
{
var size = 0;
while(size < 99)
{
my_text.font = font_arr[size];
size++;
wait(5);
}