Creating LODs for modded peds

[Lisander]

Hello everyone, i've been searching for litteraly months right now, how to make custom LODs for some modded peds models which doesn't have one "bone stock". So here it is :
As you can see on the pic above, I have a model with meshes with high details but nothing on the medium and low rank. This leads to have a highly detailed model in game but when you go too far from him he instantly became a blur pile of shit at a point you can't even tell if it's a ped or a prop. I'm trying to find a way to import those "high detailed" meshes into the medium and low detailed level. (I don't care if the thing is not optimized cause it will not be, considering I will import high polygons models in low LOD). If someone have a solution to that, I'll be very pleased.

P.S.: Scuse for my bad english, I'm french.