Cleon
Legend
Spell Penetration is fine and is close enough to metamagic for me.
Rather than stat up a whole leader (and get into the issue of whether to list the CR separately, etc), we could just give an underbar (or comment in flavor) about the likely level of a leader, feat selection, etc.
So something like "Tso leaders are typically sorcerers of at least 6th level with the Heighten Spell and Quicken Spell metamagic feats."?