[Raycast, Mesh, ECS, Job] Mesh with much vertices. What is the best way to render and collide?

Hi, i need some help to optimize some issues.

what i have to do

I have to raycast a spezify structure (Mesh) to get the normal from RaycastHit. I tested two ways. This Mesh have to do no change in the szene (Same Transform and Shader(Material))

1. Build a big Mesh with the max Count of Verticies of a Mesh (65536). --> Slow --> MeshCollider (not possible)

2. Build a template (pattern) with 72 Vertices and take it as Entity. --> Slow, but better like the first step --> (no Entity) MeshCollider possible --> (Entity) Don't know to add a MeshCollider (the Internet say this is not possible or easy like simple add)

What is the possible way? (more GPU Power is no problem but not the answer)

I hope anybody have some tipps. Thank you