here is a Lua script for helping in the substitution of an obj static mesh with an alembic scene file:
The script connect the materials only if the names of the alembic pins is identical.
you need to select both the obj, with all the materials that need to be transfer exposed as external node in the graph editor, and the abc node where to transfer the materials and then run the script.
it should end up with something like this, now all you need to do is to connect the abc node in place of the obj one. I have had not so much time for testing it in different conditions, so, please let me know if you have any issues
Here is another script, but this time as a scripted graph that can be imported via orbx directly in the graph editor. What it does is to transform an alembic camera into an Octane Thin-lens camera node or panoramic camera node:viewtopic.php?f=73&t=49960#p247572