It’s possible, just disable the crate and build entity, I did it on 1944 Nordwind because Kommando disabled the crates for Truck Barrier but not the Build entity, so people got blown up while trying to build it x) No need to recompile.
Will do it 
Edit:
Yeah, you disabled crates (materials) but not build entity. I will open the BSP and original script in ETScript.
Is it original Caen, or Caen 1/2/3/4?
Edit 2:
Decompilated because couldn’t find a misc_constructiblemarker… Because there isn’t for it, just for Bridge and Barrier. There’s the gate_toi to turn off maybe, materials are models and the mover.
Maybe kill gate_target? Will try it on my install
Edit 3:
Got it to work the way expected. Here is the code:
gate
{
spawn
{
wait 200
constructible_class 3
setstate gate_materials invisible
}
buildstart final
{
}
built final
{
}
decayed final
{
}
death
{
remove
setstate gate_toi invisible
wm_announce "Axis team has destroyed the gate!"
}
}