Sacrosanct
Legend
I'd approach it as simply as I could with two additions: (I know this might not be perfectly balanced or whatnot, but I really don't worry about that. Never have)
Instead of changing into 1/3 your level CR, up it to 1/2 your level in CR
Since using spell slots to heal, but if you no longer have spell slots, you need to tweak that a bit. If you convert all spells to healing, a current moon druid can heal:
2nd level :3d8 worth of healing
5th level: 16d8 worth
11th level: 47d8 worth
17th level: 71d8 worth
You also give up cantrips. Going from 1/3 CR to 1/2 CR is a big jump and almost worth the exchange just by itself. But what I'd do is give the shapeshifter the ability to use an action to heal up to 2d8 per druid level, split however you want. For example, if you're an 11th level druid, you can spend an action to heal 5d8 one turn, and 6d8 another turn if you want. I know you could probably make the class a lot more complex than that with different options if you want, but I've always preferred simple is better. YMMV of course. If I were to add one thing, it might be to allow shapeshifting equal to your WIS modifier, instead of 2x
Instead of changing into 1/3 your level CR, up it to 1/2 your level in CR
Since using spell slots to heal, but if you no longer have spell slots, you need to tweak that a bit. If you convert all spells to healing, a current moon druid can heal:
2nd level :3d8 worth of healing
5th level: 16d8 worth
11th level: 47d8 worth
17th level: 71d8 worth
You also give up cantrips. Going from 1/3 CR to 1/2 CR is a big jump and almost worth the exchange just by itself. But what I'd do is give the shapeshifter the ability to use an action to heal up to 2d8 per druid level, split however you want. For example, if you're an 11th level druid, you can spend an action to heal 5d8 one turn, and 6d8 another turn if you want. I know you could probably make the class a lot more complex than that with different options if you want, but I've always preferred simple is better. YMMV of course. If I were to add one thing, it might be to allow shapeshifting equal to your WIS modifier, instead of 2x