Artifact book (novel?) that when read teaches you one level of any skill. This may include skills you are restricted in (though it might only raise it to Unskilled) and skills past your role’s cap.

Wielding a weapon while getting crowned either unrestricts it if you were Restricted in it, or otherwise raises your skill cap an additional level, up to Expert. Though this is obviously bad for inter-role balance.

If you defeat a monster that generates with an artifact weapon, that weapon’s skill is unrestricted for you, so that you can actually use it. Possibly only do this for monsters that are guaranteed certain artifacts, like Kas in EvilHack, rather than extending it to any random monster.

Remove the feature where being gifted an artifact in a restricted skill unrestricts it to Basic; compensate for this by fixing the balance of artifact base types and the gifting logic so that your god’s first gift to you is never an artifact whose skill you’re restricted in.

Add some mechanic that allows you to pay for training to unrestrict a skill and bring it to Basic. Players of any role are also able to get riding training.

When a Priest is gifted an artifact weapon, they are unrestricted in its skill and their skill cap in it is set to Skilled, rather than Basic.

Multi-skill gifted weapons should unrestrict all of their skills.

Gods may grant a saddle as a sacrifice gift and unrestrict riding skill.