[1.16.5] Player transforming into a mob

[RobinCirex]

Hey, I want to make a mod where the player transforms into a monster that has special abilities. I have the model, textures and animations (using geckolib) made and I wanted to ask you guys for an opinion: How would I go on about this?
I'm thinking of 2 options: 
Either override the PlayerRenderer and add the special abilities to the player or make the player invisible and kind of make the monster follow him around constantly. What do you guys think?

[Godis_apan]

Add a capability to the player, send a packet and change model in render events.