Ok... I start with apologizing because my main pc is now and infected and is to slow to run tf2 (dont ask my how i got that virus) and I can no longer test this :/
Anyway from memory (it's been 2 months
)
Put the model somewhere in the map (it has to be in the memory when loading the map)
Compile your map
This is the most crucial part, but i've forgotten the command :facepalm: . But there is a command that shows you all precached files. Each file has a number. write it down or remember it
Go back to your map and add this
OnMapSpawn: addoutput modelindex <number here>
The model will change in the model with the modelindex. I have tested this with dispensers, and they lost their particles (healbeam). So in theory the intel should lose it's particles aswell.
I'm also not sure if this is only client side, or also server side, but after a few reboots of my pc it still had the same modelindex.