Marek Netzel

So few month have past since my initial reply. There are few additional things to say.

In UE5 there seems to be not convex collision meshes limit, you can put 1000 So there is no need to monitor what convexde composition SOP is generating.

The other thing is that you can actually export from SOP context with rop_fbx. You simply add primitive string attribute "name" with correct names per LOD stream.

"LODGroup/LOD0"
"LODGroup/LOD1"
"LODGroup/LOD2"
"LODGroup/LOD3"

and

"UCX_LOD0_0"
"UCX_LOD0_1"
"UCX_LOD0_2"

for convex collision shapes where the number at the end corresponds to segment attribute from convex decomposition SOP.
You can put a primitive wrangle after it and put

During save don't for to toggle "Build Hierarchy from Path Attribute" in the rop_fbx and change standard "path" to "name".
When importing in unreal toggle "Import Mesh LODs" in the importing dialog (Mesh section).

In case someone is reading this thread lately - like I did.
The answer is here: https://www.sidefx.com/docs/unreal/_f_b_x.html [www.sidefx.com]

If you want to export Blend Shapes to Morph Targets in UE4, your asset's network needs to be "FBX Compatible". Please make sure that there is no nodes that modify the geometry after the blendshape nodes. Nulls, switches, caches, attributes, skin deform or merge nodes won't block the blend shapes from being exported, but nodes that alter the geometry, like a subdvide for example, will.

This also works without Houdini Engine!
Cheers!

The solution is here:
https://www.sidefx.com/forum/topic/59583/?page=1#post-333638 [www.sidefx.com]
Cheers!