Not sure if the 1 in 10 twist of the Enfield barrel will work. If anything it will be a tad on the fast side so I anticipate it should work OK on a slow mover like this. Kind of like windmilling a soft ball, only slower and not as flat a trajectory.
Since this was a Belgian made turn of the previous century firearm the thread is unknown. It seems to use various threads. Again, since the bore is so small it is hard to get a read on the thread pitch and profile. One cannot see the thread pitch gauge perpendicular to the gauge. I have played around with it a bit and think I have the thread figured out but still have some niggling doubts.