One option, just 'cause no one else has posted it yet...
Instead of having alignment be as indellible as a fingerprint, have it fluctuate based on the party's recent deeds. That fighter
was lawful good, until they made a habit of extracting fingernails as well as information. This is a paramount consideration for paladins and clerics, who may well have to act as the party's more compass as well as walking BandAid, and opens up new RP subtexts all 'round the table. Maybe after
atonement,
commune, penance at a suitable shrine, or whatever the fitting recourse seems, they'd not need worry that the next
order's wrath, for example, would either dud or wipe out half the party - there's more to being a goodly hero than stabbin' at what takes a stab at you.