Well, I'd argue in favor of changing the counter in a way so that the player would have to have every possible
latifundiae in Italy, but only there (
maybe (an) optional region(s) in Sicily). It might be an option to increase the base farming in 1 or max. 2 regions, but only where it makes sense, as the base farming level ought to be correlated to a regions fertility/climate in real life. Giving level 3 to every region in Italy is no solution in my eyes. Also keep in mind that for the Romans in Republican times, the Cisalpina (the whole Po valley, Liguria, Venetia) was no part if Italy.
The economic and societal changes, which occurred over the course of the 2nd century BC, took place in Italy only (although there were the Sicilian Slave Wars, which could hint at related processes). By this time the Romans had stopped establishing new colonies (so there were hardly any Roman (and Latin) citizens outside of Italy) and the aggregation of farm land by rich land owners slowly eradicated the position of small farmers, for whom serving as soldiers became more and more difficult, as they had to bring their own equipment. And, of course, this did not happen in all of Italy in the same pace and magnitude (
so there is a reason for different base farming levels).
I highly simplified this process, but it was one of the factors that brought about the military change we use to call "Marian reforms". I think the reform counter -- as it is laid out -- points at just this process and that makes a lot of sense, imho

... In contrast to triggering the Marian reforms by just some kind of technological advance!
And to balance out the removal of the year condition you could increase the number of provinces needed.