With the teams we have I think the AL alignment is pretty simple with:
ALE: Jays / O's / Sox / Yankees
ALC: Twins / Tigers / Sox / Indians
ALW: Astros / A's / Angels / M's
NL I would suggest either the Braves in the West, given their previous residence there, for:
NLE: Marlins / Phils / Expos / Mets
NLC: Reds / Cards / Cubs / Pirates
NLW: Dodgers / Giants / Padres / Braves
Or geographically with the Braves in the Central and Cards in the West, for:
NLE Marlins / Phils / Expos / Mets
NLC: Reds / Cubs / Pirates / Braves
NLW: Dodgers / Giants / Padres / Cards