So talk me out of the ritual caster feat at 4th level, because right now it seems like a sky blue no brainer. Sorcerers have a very limited number of spells know, and ritual caster can effectively double that number. They all take 10 minutes to cast, but they are utility spells that you generally only use outside of combat anyway. You get access to spells that sorcs would never otherwise take like alarm, detect magic, identify, leomunds tiny hut, awesome spells that are simply too situational to take with a limited spell list. So far as I can tell there are no restrictions on using metamagic on rituals, since the wording of rituals is you cast the ritual as a spell, and metamagics only requirement is that you use the metamagic while casting. So you could extend rituals, twin them, and even heighten them.

The only downsides I see are the 13 int requirement, which might tough for some builds, and loosing out on +2 to your casting stat, which hurts at low levels.