One of the largest issues with the clones as presented is that they are hemed in exclusively as warriors; they are, but they need enough play in their concept to make the squad leaders, slicers and the like that would also make up the army. It's worth nothing that the vast majority of their experience was forged through more or less constant combat simulations and evaluation exercises which in itself could be considered a full series of adventures for a cast of growing PC's. The template itself should only really provided to clones that were rushed through their training to quickly meet a demand for war
In all honesty I would treat clone troopers themselves as humans using the basic template (2 all round); but give their focus almost entirely to warfare themed skills (they can select any two from Gunnery, Ranged heavy, ranged light, melee or brawl), and can start off with a three ranks in any combat check to reflect specialised training, use Cornelia humans as the prime example of a clone variant if you want to make a balanced species and use the ranks and professional knowledge to separate themselves from other similar templates.
That way starting in a military career means they can have a strong military bant that is broadly specialised without completely hemming off other character concepts. A character that with 3 agility and 3 ranks in ranged heavy is arguably much better then a guy with 4 agility ranks because those dice will yield more consistent result, while allowing other options to be opened.
Republican Commandos, Arc Troopers would likely be much closer to their spiritual father in stats and would be broadly superior. Either as really experienced PC's or badass rival or nemesis class characters.