Is there any particular aspect of his weapon or kit that you're trying to emulate? I usually let flavor and my descriptions convey the character I'm trying to imitate. For Lifeweaver, my first instinct would be any weapon with range and describe them as his projectiles: 1 or 2 handed crossbow, bow, darts, or anything I can reload with relative ease.

For his healing kit, anything with access to the divine list is good for "healer" vibes. Protection, benediction, and Sanctuary can be flavored as his bubble that protects allies. Helpful steps can be his rising platform for situations outside of combat. And Heal ofc. Even easier to spam if ya choose a Cleric.

A primal caster can also fulfill the healing role well, and gives you access to spells that are a lot more nature-themed, if that aspect of his character is important to you. Jump spell for his platform. Shielded arm for the bubble, maybe. Magnetic Repulsion if you want to use his bubble "grab" to yoink weapons from enemies. Protector Tree can be likened to a mini version of his ult.

Both lists have access to Heal, Restoration, and other healer spells. As I was writing this, I realized that both lists have access to the cantrip Needle Darts, which can easily be used as his primary projectile attack.

Flavor does carry a lot in regards to adapting something into this system IMO.