Cecil would be a standard Lancer and Terra would be like a Knight with sub Black Magic.
I think Cloud was a decent character. Another cool character from the regular FF series (7 or before) would be Strago, the Blue Mage. His entire Blue Magic skill would be based off of Enemy Skills and you CAN'T learn from friendly monsters.
NAyhow, I hardly think FF7 needed the publicity from Tactics, it was more like the other way around. All the FF7 fanboys would learn that Cloud was a character and buy Tactics on that premise. But, most people buy games for better reason than :Hey, Cloud is in it!"... But that's Ehrgeiz's whole speil so... I dunno.